Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 873 28107 found under Seal Rear Bearing O by Seagrave Corp The. The National Stock Number assigned to this part is 2990006768357, and the Federal Supply Class is 2990 Miscellaneous Engine Accessories Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 873 28107.