Some time ago I ordered rear brake rotors, two sets in fact, for my 91 and 92 300D. Ordered Balo as I've always had success with them before. Got a call from my indie and he said they wouldn't fit. On my wheel hub there is a locating pin in addition to a set screw. There is no hole for the locating pin on the rotor. See pics below.

Did a little research. Found out (someone can correct if I'm wrong about any of this): (a) the locating pin was of use in the manufacturing process to align things; (b) it serves no mechanical purpose once everything is put together; (c) MB at some point decided it was unnecessary; and (d) it can safely be removed to accommodate a wider variety of rotors....that's what I've done.

The parts supplier in Arizona makes these issues very clear....for my cars, I'd have to get a Bosch rotor if I didn't want to eliminate the pin. The Pelican site is deficient in this respect; it makes no mention of the issue and every pic they show of the rotors that they sell for my cars shows only six holes.

So, just one more thing to be aware of.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles
06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 72k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife