This listing is for one 46329 complete ready to install pinion gear, bearing and hub for the Gribaldi Salvia DM Series disc mowers. Please reference position in the exploded view of the mower. This is the non vented hub & pinion, if you need to replace the vented hub and pioion we have them listed in our store under code 46330 We also have other parts for this disc mower available in our store. We sell many replacement parts for the most manufacturers of tillers, finish mowers, spreaders, 3-point hitch hay tedders and sickle bar mowers. If you don't see the parts you need listed please contact us we would love to earn your business. We are listing new items frequently so please check our store often. Part Number: 46329 We stock a wide variety of replacement parts for Agricultural Equipment please contact us if you have any questions or if you would like more information.