Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 72-1063B found under Muffler Asy by Maremont Corp. The National Stock Number assigned to this part is 2990007735584, 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 72-1063B.