Hi can you please look into this item. We have two different parts in location. Please pictures. The darker one I think is the wrong part but the item description is correct. The white part looks like the right part, I checked in the one source website but the item description is roller unit. I am going to put a hold on these items for now until I find out what the correct part is. If it is the white part then we need to get the description changed on either the part or our system