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I just checked my stock of parts, and both my 0.7 and 1.1 spare starters have 9 teeth on the pinion gears. I wasn't able to fit my calipers around the gear with the starters assembled, but I did cut out a cardboard template, and both gears are identical in diameter, at least as far as the cardboard is concerned. Error in measurement could easily be 0.050", or whatever guess you'd like to make, just because the cardboard isn't as rigid as a metal caliper. This particular 1.1 was from a friend's very low mileage and very original '74 Spider, and FWIW my own low-mileage '74 also came to me with a 1.1 starter (in both cases without the motor mount brace that later cars had). Maybe some '74's had the big starter, even though the change wasn't "official" until '75.
I should also mention that starters and alternators aren't exactly rocket science, and in Zinhead's (the originator of this thread) case, local starter/alternator shops can often be very useful. Bosch starters and alternators are just as generic as can be. If you need a starter drive, solenoid, brushes, whatever, take the starter in and have it looked at. The rebuilder isn't going to care if it's from an Alfa, BMW, Porsche or Volvo, and isn't likely to add on the "Alfa" fee like IAP will. If the solenoid also happens to fit an old Beetle, ,that's what you'll get charged for. Of course, if you take the whole car in, you're likely asking for trouble.
As an aside, maybe a year ago I saw a NOS Ferrari F40 starter on eBay, and I'll be damned if it wasn't the same gear-reduction starter we've been discussing. Starting bid was $2400!!!, but it was in a pretty yellow box with little black horses all over it.
Regards,
Dean
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