Performance Machine 0053-1608Ds-A Sintered Rear Brake Pad For Harley Softail For bikes running aftermarket rear calipers from Performance Machine, refresh brake performance with a set of new Rear Sintered 0053-1608Ds-A Brake Pads. Replacement rear brake pads for 137X4 4 Piston Integrated Rear Softail Calipers from Performance Machine. Features: Sintered Compatible with 137X4 4 Piston Integrated Rear Softail Calipers For Performance Machine Brake Calipers only Sold in pairs