In my search for the alt i just replaced in my 86 300td, i found that the only difference in any of the alts for any benz is the pulley and the wiring. i looked at a lot of cars from the late 70s 240 up 190s from the early 90s. the mounting lugs are the same on all. any alts over 70 amps have a stud to feed the power to the battery the others have 2 large spade terminals. i ended up getting a 70 amp unit off of a 89 190 with a 4 cyl gasser in it for $25, it look like a new reman and it bolted on with no changes.

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82 Rabbit diesel (first d), 84 Jetta turbo d (300k when sold), 83 240d (305k when sold), 84 F250 6.9d w/Banks turbo(parts truck), 86 F250 6 cyl.gasser(waiting for 6.9d), 84 300d ( 347k Sold 8/04), Y2k New Bettle TDI (185k miles), 95 740IL (wifes), 87 300TD (206k Sold 7/05), 05 Passat TDI Wagon