Rear brake shoe set for Yamaha 73-74 TX500, 81-83 XJ550 & 80-83 XJ650 models. Dimensions: Diameter: 179mm, Width: 40mm. Replaces OEM Ref#4H7-W2536-00. While you're replacing the shoes, might as well replace the springs and clean up your drum as well. Check fitment info for all models and year ranges.