patio door roller mechanism

A home owner from Redlands, CA says:
These were installed circa 1978. Nylon wheel on one side broken. Wish to replace both left and right wheel mechanisms if possible. If not entire mechanism (preferred), then perhaps wheels alone. Didn't take photos of mechanisms installed. I appreciate your help.
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Casey from SWISCO responded:


Take a look at another thread here where a customer stated that they were able to use our 81-148 to replace the Del Mar roller in your photos. Take a look and see if this could work for you as well. Thanks for posting!  

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