Searching for sliding window roller, 5/16" concave whe

A quick learner says:
March 27, 2018
Looking for replacement window rollers, plastic, Radco Weather Lok, please see attached photo with all measurements.
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Casey from SWISCO responded:
March 28, 2018
I'm sorry but we never received your photos. If you could resubmit them we'll take a look and see if we can match it to one of our window rollers.
A quick learner from California says:
March 28, 2018

See photo.

sliding roller

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Paul from SWISCO responded:
March 29, 2018

I'd recommend comparing your part to our 87-200 Radco roller assembly.  
A quick learner from california says:
March 29, 2018
Thanks. I'll be buying 72!
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