Comparison : Item # 64145-8, WR284 (R32) Waveguide Spacer
Item # 65378-8, WR340 (R26) Waveguide Spacer
Item # 65830-1, WR430 (R22) Waveguide Spacer
Item # 51063-6, WR650 (R14) Waveguide Spacer
Item # 80844-0, WR770 (R12) Waveguide Spacer