replacement rollers

A quick learner from Seattle says:
Hi there. I have 2 8' aluminun sliders that are tough to open. I am sending a picture of the assembly and hoping it's enough to identify a replacement. I'll need 4 of them. I also wanted to get some weatherstripping if you sell that. Lastly, the doors have been tough to get out as the track assembly doesn't clear the frame by much. I know they can be adjusted but I was thinking to get a track cover as well for both doors.
Patio door double rollers
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Dave Sr. from SWISCO responded:
Thanks for your inquiry. Please start with taking a look at our 81-056 roller as well as our 81-173 tandem roller. See if your measurements match ours. If not, please reply back with the height and thickness of housing measurements as they are the most important measurements needed in locating a replacement for you.
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