This set of primary drive bearings is a perfect fit for Honda CB750 DOHC models from 1979 to 1983. The bearings are designed for optimal performance and reliability, ensuring a smooth and efficient ride. The set includes two bearings, both with a primary drive plain bearing and primary drive grooved bearing. The OE/OEM part numbers for these bearings are 91007-438-003 and 96100-62040. These bearings are Japan high quality replacements for the Honda engine with a special production custom adapted grooved bearing, this grooved bearing is not available through any Honda parts supplies anymore I have these fully custom made.