Product Code : RB-Sct-230 sprocket in the pictures there is a hub attached to the sprocket. What is the part number? I am looking for a hub that has a 3/8"" inch diameter IS hole with a set screw that mounts directly to the side like the one in the second photo. I believe the one pictured has a 1/2" diameter center hole but i cannot find what part is pictured.
Please advise.