Wiseco BK5031 Wiseco 39x65x18 & 30x72x19mm Main Bearing KitWiseco BK5031 Wiseco 39x65x18 & 30x72x19mm Main Bearing Kit Wiseco main bearings are manufactured by many of the same suppliers to the OEMs, including leading Japanese manufacturers, and are inspected for accuracy, function, and cleanliness for efficient and reliable service. Manufactured by the same suppliers to OEMs, including leading Japanese manufacturers Precision machined and finished with high quality materials Inspected for accuracy, function,