The DFC brake wheel cylinder for 2004–2008 Chevrolet Silverado 1500 Classic is a replacement wheel cylinder specified for the rear position. The description cites the model and year range so owners can confirm rear wheel cylinder fitment when servicing brakes or replacing the rear wheel-location cylinder on Classic Silverado 1500 trucks of those years.
DFC 04-08 Chevrolet Silverado 1500 Classic Rear Brake Wheel Cylinder