Ply Gem sliding glass door rollers

A home owner from Rockwood, Michigan says:
December 30, 2020
I bought a house and the owner told me my doorwall has a lifetime warranty. But since there are no identification numbers they will not help me. The attached photos show the rollers i need to replace. Any assistance anyone can provide would be greatly appreciated.
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Julia from SWISCO responded:
December 31, 2020

Thanks for posting. These old 'tank tread' rollers are no longer made. However, we've had people successfully use the 81-279 as a replacement. The adjustment screw sits a little higher than on your old roller, but the wheel runs nicer than the noisy treads. Let us know what you think.
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