Square Wheels

A quick learner from Carmel Valley, CA says:
Hi, it says on the housing
Del Mar Eng.
PAT 3 670 357
The wheels definitely need replacing because
they're square now, but I'm
happy to buy the entire thing
Thank You!!!
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Bob from SWISCO responded:

See our 81-093 Roller. The Screw Tab isn't straight like your old one, but I think it still could work. Just go over the dimensions to make sure everything otherwise matches. 

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