Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1977-MC32-20052 found under Bracket Muffler Rea by Wheeler Bros Inc. The National Stock Number assigned to this part is 5342010774917, 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 1977-MC32-20052.