These appear to be 81-004. The wheel is 1 1/2 " and the roller is 2 5/8" across the top . All other measurements are the same as in your diagram. Can you please confirm before I order. Thanks!
Bob from SWISCO responded:
October 23, 2020
Thanks for posting. Yes, if the width and height of the roller match, and the wheel diameter is the same, then I think the 81-004 is the right choice. Let me know if you have further questions.