Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 20177 found under Cushion Seat Back A by Castle Industries Inc. The National Stock Number assigned to this part is 1680013514545, and the Federal Supply Class is 1680 Miscellaneous Aircraft Accessories And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 20177.