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Trained (ex)Professional, , 1953-2018 RIP
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16,232 Posts
Easier asked than answered but here goes.
To my knowledge, there are six variants of the 1750 GTV;

Type 105.44 - non-USA
Type 105.45 - Righthand drive
Type 105.51 - USA

There is also a Series 1 (up to chassis #1375000 for the 105.44, 1454000 for the 105.45 and 1532000 for the 105.51) and a Series 2 (or Mk1 and Mk2 if you prefer) within each type. The series change occured sometime in 1970, I think.

Side markers - 105.44 & 45 S1 none, 105.44 & 45 S2 small round amber-front only, 105.51 S1 small round amber in front and small round red in rear, 105.51 S2 large rectangular-amber front-red rear.

Brake hydraulics/pedals - 105.44 & 45 S1 single circuit w/standing pedals, 105.51 S1 tandem circuit w/standing pedals, 105.44 & 51 S2 tandem circuit w/hanging pedals, 105.45 S2 tandem circuit w/standing pedals. The 45 S2 also had early and late versions of the master cylinder - the late one added a small reservoir and bleed screw.

Front bumpers/parking lights - Series 1 bumpers have no over riders-Series 2 do, 105.44 & 45 S1 have the p/lights mounted to and above the bumper, 105.44 & 45 S2 p/lights are mounted to the body above the bumper. The S1 lights, doubling as the side markers, have lenses that are amber on the outside only- clear otherwise. S2 lights are all clear. However, cars exported to Austria, Denmark, England and Germany were fitted with different lenses. Maybe they were amber? 105.51 S1 & S2, which are not interchangable, are amber and mounted below and to the bumper.

Non-US cars have carbs - the US version uses Spica fuel injection and related emission controls.

All S1 cars have gear type window regulators - S2 have the cable type. The US version also uses different window crank and 1/4 window handles.

On US cars, the center switch (all three switches have labels) on the console operates the fog (driving) lights - on Euro cars, the switch (all early S1s are un-labeled) works the dash lights.

US cars have the shift pattern on the shift knob, the S1 Euros don't (don't know about the S2).

US cars have "Alfa Romeo" in big block letters at the rear, everyone else already knows it's an Alfa.

Euro cars use a Bosch distributor, US gets a Marelli.

The dipsticks are on different sides of the engine.

Heater control plates are different (US version is, of course, labeled).

US version S1 front seats have different headrests.

Gauges - English units of measure for the US, mostly metric elsewhere.

Differential ratio - 4.56:1 for the US, 4.10:1 Euro.

Steering wheel - black plastic for the US, wood elsewhere.

Lower radiator hose arrangement - Euro cars have three hoses with a 'Y' connector - US cars have a single hose.

And as far as the radiator fan goes, I think that they're both six blade (or is it five?) but the US version has wide, straight blades while the Euro has thin, tapered ones.
 

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Trained (ex)Professional, , 1953-2018 RIP
Joined
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16,232 Posts
py105 is right; the first use of the number plate housing with block letters was the 1972 US 2000 GTV. The S1 & S2 US 1750s have the block letters on the trailing edge of the bootlid. The pic below of a US 71 also shows the INIEZIONE badge was moved from the rear panel to the bootlid to make room for Alfas first use of the large taillight assemblies.
 

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