Need roller replacements please!

A quick learner from Riverside CA says:
I'm having trouble identifying this roller. The house was built in 1987 and the windows are original. Any help would be appreciated.
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Bob from SWISCO responded:

These sliding window rollers can be very tricky to replace, since the new ones have to be exact in dimension. The 87-020 or 87-153 come to mind as our closest options, but I have doubts either match. Take a look and see what you think. 

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