SWISCO - The Replacement Hardware Authority

sliding door rollers

A quick learner says:
Is part number 81-151 (Tandem Patio Door Roller, Flat Nylon) the Nylon equivalent of 81-149 (Stainless Steel Sliding Glass Door Tandem Roller)?
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Donna from SWISCO responded:
No, SWISCO product code 81-151 has two flat edged wheels and the 81-149 rollers has concave wheels.
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