Patio Door roller assembly

A handy person from FREELAND WA says:
Hello I need the two bottom roller mechanisms for my glass patio door, the dimensions of the slider are 78"x36'x1,1/2"
The roller assembly itself as pictured is 2 and 1/2 inches long by 3/4 inches width by 1 and 1/4 inch with the wheel mechanism able to extend out another 1/4 inch
The only markings I could find are as follows:
AA/MA ANSI/AAMA 101-85
SERIES 420
SGD-C20
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Lauren from SWISCO responded:

Hello, thank you for posting! 

We do not have your exact roller, but please start by reviewing the dimensions of the 81-039, 81-256 and 81-269 rollers. Please let me know what you think! 

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