I need two of these. Looks like product 23-085 on your site
Paul from SWISCO responded:
September 22, 2017
Hello from SWISCO.com! We carry two offset rollers for these old Sterling twin 7/8" wheel hangers: Our 23-085 has a 11/16" offset and our 23-087 has a 3/16" offset. Please compare your measurements to ours and see what you think.