I would install cross drilled for looks only, I know they are pointless on street cars. However newer MB's come with cross drilled front rotors stock. I wonder why?

BTW W126 front calipers are 2 piston.

I stand corrected, I just looked at the calipers in the garage and they are 2 piston.... I must have been dreaming....:rolleyes:

I tried this once on my car. I couldnt tighten the calipers since it was hitting the hub, so I abandoned this project. I probably got the wrong set of rotor & caliper. Do you know which model/year benz should be used so it would fit the 123s? The SD rotor I have was about 1/4" inch shorter than my original rotor.

bump. Anyone pls.

You'll need to swap the vent pans and hubs, the calipers alone won't fit...