Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number OPT-0091-006 found under Cable Speedometer by Dm Mfg Inc. The National Stock Number assigned to this part is 6680015295736, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like OPT-0091-006.