Sliding door parts

A home owner from Michigan says:
Hi,
I spoke with Tim on the phone and he told me the Truth 31761 roller assembly pictured should be replaced with the 81-018. My question is do you carry the plastic rail part that the rollers fit into that is held in place by the rollers in the bottom of the door?
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Tom from SWISCO responded:

I don't know what the plastic part is you refer to. Could you be talking about the bottom rail of the door itself? If so, that's not something we can supply. You would need to contact the original makers of the door for that.

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