Pocket door hardware

A home owner from Parkland fl says:
Difference between 4 wheel trolley, 23-189.

4 wheel pocket door carrier, 23-161.

I have a acme, 30-1001 which I'm trying to replace.
User submitted a photo of a pocket door roller.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Thanks for posting. The 23-161 is a heavy duty trolley for doors weighing 100 pounds and has 7/8" diameter wheels. The 23-189, on the other hand, is for a standard weight door and has 3/4" diameter wheels. Which is closer to what you need?
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