PE Del Mar rollers

A home owner from Pittsburgh says:
Looking at the Del Mar web site, I believe this unit is SKU#F3727. I'm pretty sure this is a 1 1/4" wheel. These are used in a pool environment, and the doors become very hard to open or freeze up after a few years. We need 10 of these units. Would stainless steel or nylon wheels prevent this?
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Bob from SWISCO responded:

It's a bit difficult to match this without knowing the dimensions more precisely. Look at the rollers I've associated on this page. Compare the diameter of the wheels and the height and thickness of the assembly to see if any of these match best. 

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