For those of you looking for something much better than the rubber NOS rollers, I have CNC machined versions out of chromolly steel of both the upper and lower rollers.
They will fit CB/CL/SL motorcycles. Upper roller is a sprocket, lower is a smooth roller. Each have high quality needle roller bearings pressed into them. Upper roller comes with a deformable rivet. Material is chromolly steel. See the following links for purchase.