bi-fold hardware replacements

A handy person from DELRAY BEACH FL says:
I have a mirrored Stanley Bifold door and the bottom nylon roller disk is broken. Where can I get one. The bottom assembly says 4405-R.
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Paul from SWISCO responded:

Hello, Joel. Your part looks very close to our 21-174 roll guide. Look it over and see if you agree.

Bi-fold Door Repairs
Bi-fold Door Repairs
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