Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SY42 XR-135 found under Antenna Assembly by Taco Communications. The National Stock Number assigned to this part is 5985016560617, and the Federal Supply Class is 5985 Antennas Waveguides And Related Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SY42 XR-135.