patio door rollers

A quick learner from Orangevale, CA says:
March 19, 2019

It looks like I need #81-174 or #81-179 rollers but the 5 short slots are missing, Could you please advice which one is the correct one or maybe it's another. See attached photos.

Thank You, Gil

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Paul from SWISCO responded:
March 21, 2019

Many thanks for corresponding with us. While the appearance of the housing is relevant to patio door roller identification, there are several critical dimensions that you should compare to your old roller. They are the width and height of the housing, and then also the diameter of the wheels. Are your door wheels 1-1/8" in diameter, the width of the housing 11/16" and the height of the housing 1-1/16"? If so, then the 81-174 matches those specifications. 
A quick learner from Orangevale, CA says:
March 21, 2019
The dimensions are a match. Thanks for your help.
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Paul from SWISCO responded:
March 22, 2019

Excellent. If you need anything else do not hesitate to ask us.
Sliding Glass Door Tandem Roller, 1-1/8"
Sliding Glass Door Tandem Roller, 1-1/8"
81-174
$15.30
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