ProX Bearing 6304/C4 20x52x15 ProX offers a wide range of crankshaft bearing of well known brands like Koyo, NTN, etc in C3 and C4 graduations. The high quality bearings will fit perfectly to OEM and aftermarket crankshaft. Please note image is for illustration purposes only. All bearings correct to OEM specification. For any applications not listed or you cant find what your looking for. Please call our sales team.