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New BMW Motorsport ring and pinion set. These sets are made of special metal and direct from BMW Motorsport.
When installed in E24M6, E28M5, M535, E34M5, or non M V8 cars which came with 12mm ring gear bolt holes in the carrier, the carrier will need to be drilled out to accommodate the larger bolts. You will also need a 14mm ring gear bolt kit.