![Used BMW 188mm 3.73 Ratio Ring and Pinion with 12mm bolt holes](http://diffsonline.com/cdn/shop/products/artsy1377722202521e5f5aa142f.jpg?v=1672213401&width=600)
Good used ring and pinion set removed from a BMW differential. Each set is cleaned and glass beaded before it leaves to ensure it is in good shape. When installing where a ring gear with 14mm ring gear bolts was, order a set of 12mm bolts and the 14mm to 12mm spacers to ensure proper operation. Professional installation is advised.