Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NO PRIMARY REF 99-763-2351 found under Label by This Ncage Is Used To Inform That. The National Stock Number assigned to this part is 7690997632351, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like NO PRIMARY REF 99-763-2351.