These engine mounts allow easy swaps of the inline six engines M103/M104 and the diesel OM603/OM606 in the W201. They have two types of mounting holes: First is like the OEM support arms found in the 2.6 m103 powered W201s. Second will put your engine 15mm. more to the back of the engine bay. Advantages start with the usage of a bigger cooling fan, installation of a 6cyl engine with the stock 4cyl radiator and front support. And most important a better balance which the w201 with 6 cyl lacks a lot!