looking for a pair of roller assemblies for a Legance vinyl sliding patio door make date 8/29/2018tandem rollers look like your 81-149 but the roller wheels are flat not concave
Tom from SWISCO responded:
September 16, 2022
Our 81-151 is similar in design to our 81-149, but has flat wheels. However I cannot verify that this is what you have or not. The only way we can confirm that this product is a good option for your door is to see the original rollers removed and without obstruction.