M12 to M14 Diff Bolt Adapters for M3 LSDs by Diff Lab
These bolt adapters enable to use of common 12mm gear sets on LSDs from E36 M3, E46 M3, M5, etc. These crown bolts are typically 14mm which means that you cannot use common 12mm gear sets from other vehicles in these M vehicles. With these 12-14mm rings you can use 12mm bolts and common gears on your M3, M5, 188mm, 188k, 210mm or 215k LSD. They come in a set of 10 rings and are made of Australian steel.