R129 brake calipers fir W124??
R129 brake calipers fir W124??
The R129 300mm roto clears any a-arm. Welded a-arms are only found on cars with M104 or M119 engine with 320mm brakes.
All you need to fit R129 300mm disc & caliper to a W124 is: calipers & discs. And if you want it done properly, master, booster and the pad waer indicator wiring loom (also plug & play).
The later 320mm brake requires welded ball joint a-arms again.