Need assembly on bottom, not top.

A home owner from Los Gatos, California says:
We are trying to replace a Truth roller assembly #4194266
The only diference between the 81-137 and the Truth, is the "2 mounting flanges with the screw holes" needs to be on the bottom of the roller assembly, not on top. Is this available? I can send you a photo.
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Dave Sr. from SWISCO responded:
Thank you for posting.

We offer double roller assemblies with mounting holes in different locations. Please start by looking at the Swisco 81-018 Sliding Door Roller.
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