Wheels on Pella trolley available separately?

A home owner from New York says:
I have an 8 ft pella designer door. It appears that the trolley is theproblem. as you can see from the photo, one end is broken. My question is do I have to replace the entire trolley or can i just replace the end rollers as this is an expensive part for the 8ft door. I have the spring too. It appears that itis your part # 80-055. with this i also need the 2 replacement receptacles for the screws. That part # i do not know
User submitted photos of patio door hardware.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting. Unfortunately, these rollers are not sold separately. You would have to replace the whole trolley.

I'm not sure what the screw receptacles are. Could I see a few detailed shots of what you're talking about?
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