Originally posted by evren
Hi Paul, i believe 65-71's used the bosch sr-17x, and the 72-89's the sr-68x..... I think they are interchangeable with some fiddling, ie you need to wire up a relay for the cold start on later cars....
The original 911 starter was the Bosch SR-17X, which is better known as the Volkswagen Autostickshift starter. It's widely available through VW suppliers.

For trivia bugs: the SR-17X used in 1965 uses a pinion gear which is different from all the others. It's what a VW mechanic would call a 6 Volt pinion.