Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 37-38 found under Coupling Half Shaft by Seaman Parsons Corp. The National Stock Number assigned to this part is 3010002228267, and the Federal Supply Class is 3010 Torque Converters And Speed Changers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 37-38.