The 400E had the same 15" wheels as the 6-cyl W124's. Hence, 400E brakes will fit under the usual "8-hole" 15" wheels. If you go with 500E brakes then 16" wheels will be required. When ordering 400E brakes make sure you get the 93 and later "update". The early 92's were a bit prone to warpage. (search Shop Forum archives for further specifics)

Hope this helps...Lee