Caterpillar rollers for a Patio door do you have them or not

A professional from Michigan 48390 says:
I do have pictures or anything else ------
I don't remember where i got them from before but this the3rd patio door i ran across with that type of roll.
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Bob from SWISCO responded:

I believe you might be referring to old old 'tank tread' rollers, which are no longer made. However, we've had people successfully use the 81-279 as a replacement. Please note that the adjustment screw sits a little higher than on your old roller, but the wheel runs nicer than the noisy treads. Let me know what you think.

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