With bearings. Manufactured from 7075-T651 aluminum. For 100+ horsepower engines. The bearing bores are held perpendicular to the mounting flange to ? .0002″. 5 times stronger than the OEM product.OEM replacement reference 35074-87; 35250-90D; 35260-90C. Note: This trapdoor will also accept the early (80-86) style transmission (clutch release) end cover but the physical shape of the early end cover is optically different.