rollers for better bilt windows

A quick learner from Petaluma, CA 94954 says:
roller size 3/8" diameter, 1/4" wide. Windows were installed about 1994. Slider by 3'x 5'.
Are the rollers available? We have 6 windows and need 12 rollers.

Dennis & Peggy
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Tom from SWISCO responded:
Good Morning, to assure the right parts for you could you send us some photos with measurements of the rollers? Thank you!
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