Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 172-393 found under Cylinder Assembly Hydraulic Brak by General Motors Llc. The National Stock Number assigned to this part is 2530002886169, and the Federal Supply Class is 2530 Vehicular Brake Steering Axle Wheel And Track Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 172-393.