Because Pro X sources their Crankshaft Bearing and Seal Kit components from top manufacturers like Koyo, NTN, and NOK, the bearings included are built to exact specifications that match OEM tolerances. With such consistent and repeatable quality you can be confident knowing your crankshaft is turning on some of the best parts in the industry. That quality also mean installing the bearings won't be a problem and that each component will be fit into your case just like it should.