Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6MR21 found under Guide Cable by Mack Trucks Inc. The National Stock Number assigned to this part is 2590015514809, and the Federal Supply Class is 2590 Miscellaneous Vehicular Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 6MR21.