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Originally Posted by Jim's500E
If you get rotors that are also internally vented then it does matter which way they are installed. Usually, like on a Porsche with drilled and vented, the holes will bend/track backwards....
...this was the case on a friend's C4S...someone put a rotor designed for the left front on his right front. Fit fine but probably won't work up to its potential when needed.
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Depends on what your driving style is.
R129 SL600s used directionally specific internally vented front rotors. as a result, 2 part numbers are required. MB is now in the process of phasing out the 2 PNs and supplying only one pair of identical rotors for replacement. This is already in effect in Canada. so one side is spinning "backwards".
Unless you're tracking your car, I don't think that this is much of an issue.