Need a replacement part number

A quick learner from Castle Rock, CO says:
Hi, I have two of these on the bottom of my home sliding door. Can u help me identify them?

Thanks!
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Paul from SWISCO responded:

Hello,

Take a look and compare the specifications of the 81-158 patio door roller to yours. Thanks for posting! 

81-158 : Dual Roller Assembly, 1-1/4
Dual Roller Assembly, 1-1/4" Steel BB
81-158
$13.09
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