Dave Sr. from SWISCO responded:
August 2, 2010
The only true way to determine which size is needed, is to actually remove your existing roller from your door, get your measurements, and match it up to our catalog. You can send us photos of your part if you get stuck and need us to take a look.
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Casey from SWISCO responded:
August 4, 2010
It looks like SWISCO product code 81-149, Sliding Glass Door Roller. Compare the measurements from the product page on our site to your sample.
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