After one of the above please if anyone is or knows someone breaking a 928, preferably the V8 model
try porsche apart
Seem to recall from when I replaced mine that there are differences between Auto and Manual, and S2 and S4 versions
You may need to be a bit more specific as to which one you are after
I may have my old knackered one in the garage somewhere that could possibly be refurbished, as it was such a ball-ache replacing it that I kept the old one. Came from a 1979 V8 928 (Very Rare Pre S and Manual box)
Found this too
http://www.ebay.co.uk/itm/PORSCHE-928-S-S2-S4-GT-GTS-STARTER-MOTOR-/111235534624?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item19e6278f20