Hello,
I have R129 SL brakes (300mm rotors) on my EVOII but I am looking to install SL600 rotors. (SL600s has 320mm rotors)

Can I change the rotor and will it fit no problem?

Thanks

nope. doesn't work that way, Henry.

you have to change the calipers to the cast iron ATE calipers used on the SL600 as well.

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'94 W124.036 249/040 leder; 8.25x17 EvoIIs
'93 W124.036 199/040 leder; 8.25x17 EvoIIs, up in flames...LITERALLY!
'93 W124.036 481/040 leder; euro delivery; 8.25x17 EvoIIs
'88 R107.048 441/409 leder; Euro lights
'87 W201.034 199/040 leder; Euro lights; EvoII brakes; 8x16 EvoIs - soon: 500E rear brakes
'70 R113.044 050/526; factory alloys; Euro lights