Dave Sr. from SWISCO responded:
October 4, 2017
Hey there! I believe your best solution would be to just replace the wheels and reuse your aluminum housing in your door. Your roller housing, I believe, is no longer available. Look at the rollers and axles suggested. As for a double roller, I'm not sure we have one to fit your bottom door rail. Take a look at our 81-138 tandem roller to see if you could adapt it to your patio door.
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