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Discussion Starter #1
Dear All , I'm looking for one of the missed part of my 1750 Duetto my 1969 , thanks for your support Fabio
 

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Dear, thanks for your suggestion, I fully agree and maybe I would be able to replicate throughout some suppliers, it could be enough to have some figures about lenght and radius as well for terminal caps. Maybe some more photos if you have a piece available or I would like to buy as well a damaged one just only to replicate. Is it a stainless pipe as well?
Thanks
 

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Discussion Starter #5
Many thanks for your support , the rear bumpers on my car have the holes for the bar while, time ago, I was able to find on ebay the front one that is in stainless steel , so I hope to be able to complete this assembly . This is really a nice community with a lot of passion and info for our Alfa ! Thanks Osso
 

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So, I tried my best to draw the arc using some string and a pencil. I think this is very close. I think the arc radius is 184cm. I will get the inside and outside lengths, next. I realize my method is quite crude, but it is the only way that I could see to get the data.

My Geometry days are long behind me. :)
 

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Just trace out the bar on a sheet of paper or poster board. The metal shop should be able to figure it from there.
 

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Discussion Starter #8
Dear , many thanks, I believe radius will be in accordance with the rear hood as well, I will do some measures and let you know. I will check for a stainless pipe as well , if available I will prefer it to have a similar brightness for polished parts, thanks
 

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Center Bar

I don't believe Alfa supplied any of these bars as original equipment. As I remember, they were made by AAMCO as an accessory and often installed by dealers as an additional option. The front center piece was original equipment.
 

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I don't believe Alfa supplied any of these bars as original equipment. As I remember, they were made by AAMCO as an accessory and often installed by dealers as an additional option. The front center piece was original equipment.
The cars left Italy with them installed. The overriders have nicely punched holes for the mounting of the bumper bar. See the attachment from the part manual.

The bumper bar your thinking of was made by AMCO and is aftermarket.
 

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center bar(s)

That's so interesting. I'm still not convinced. The parts image shows just one bar. Parts images are pretty accurate. I stand corrected that there is an Alfa rear center bar, but as shown, I have never seen it. As a part number starting with 10503, it must have been available on the 1600 Spider. I have never seen one that I can remember on either S1 model. Nor do I remember the illustrated license plate backing plate on S1 spiders. I don't think the upper crimp of the body mounted plate holder would allow such a plate, but that's conjecture. Maybe these items were regionally ordered. Maybe my memory is just bad.
The AMCO bar looks like the bar on the ivory spider.
 

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67 1600 Spider no bars
69 1750 Spider had bars
Cheers, Jon
 

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That's so interesting. I'm still not convinced. The parts image shows just one bar. Parts images are pretty accurate. I stand corrected that there is an Alfa rear center bar, but as shown, I have never seen it. As a part number starting with 10503, it must have been available on the 1600 Spider. I have never seen one that I can remember on either S1 model. Nor do I remember the illustrated license plate backing plate on S1 spiders. I don't think the upper crimp of the body mounted plate holder would allow such a plate, but that's conjecture. Maybe these items were regionally ordered. Maybe my memory is just bad.
The AMCO bar looks like the bar on the ivory spider.
This was only found on the US spec 1750s. Yes, there is only one bar. It's a genuine Alfa part.

The picture of my white Spider has the Amco bumper bars and the correct license plate backing. Once again, this is a US spec car and it was very different from what every one else got.
 

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The grill guard and rear bar were required by the Fed's. Just like the Kammtails had the black rubber grill guard when new.
 

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center bar(s)

Guess I'm outnumbered and probably wrong, but:
A quick mental review of early 911s and early 70s Camaros makes me wonder if the Feds were bumper conscious at that time. I thought the bumper crash test standards started in 1974. There was no rear center bar on 911s up to 1974. There were some split front bumper Camaros in 1970 and maybe 1971, with no grille guard. Probably true for some other makes too.
Also, why would Amco make and try to sell a center bar if the factory already supplied one? They sold a bunch.
I wish my memory was better.
 

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Discussion Starter #16
Rear bumper nerf-bar

Dear , here you find hole and slot of the rear bumpers showing what Osso said they were from factory and or this model year IMG_0691.jpg

IMG_0692.jpg
 

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Discussion Starter #17
Center front Bumper

Dear here you find the center front Bar I bought some time ago perhaps new with the references as for Osso IMG_0693.jpg

IMG_0694.jpg spare-parts catalogue , from pictures another code as well is noted by I don't know where it comes from
 

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Bumpers

No argument on the front guard; just not sure if it was there because of a federal mandate.
I've fooled with roundtails since 1970. I think the picture of an obviously factory made slot in a rear overrider is the first time I've ever seen one. I have a bunch of used overriders in my shed; some have two holes drilled (crudely) for what I've always believed to be the Amco bar. No slots. No argument that Alfa provided such a bar, but was it universal on a 1969, USA S1?
 

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Dear here you find the center front Bar I bought some time ago perhaps new with the references as for Osso View attachment 1536218

View attachment 1536220 spare-parts catalogue , from pictures another code as well is noted by I don't know where it comes from
That is a very nice NOS part. I have a very nice used one on my car. Most of the used ones have some damage. I have a spare that we professionally repaired. There are ten hours of labor in it.
 
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