PPG Herculite K sliding patio door rollers

A home owner from Yukon , OK says:
I have a PPG Herculite K sliding patio door installed in @ 1980. The rollers have worn to the point that it is difficult to open the door. Is there replacement rollers for this door. It is a little over 6 foor wide. If so how many are needed to replace all rollers
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Paul from SWISCO responded:
Thank you for posting. It's possible you have our 81-018, but I can't be sure. Herculite K is the company that made the glass, not the door. Carefully compare it to your own roller and see what you think.
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