Milgard Window Rollers - looking for replacements but cannot ID the part #

This window was in a house built around 1992, that was part of a large development; I mention that only because some developers get custom . The original rollers have degraded to the point where the window is scraping on the aluminum frame. The dimensions are approx. 1.25" long, the Width excluding the flange - i.e., the part that inserts into the window frame itself - is 0.25" Wide. The Width including the flange is 0.50". The height could have been 0.5" but that is an estimate since the component is so worn down some of it is missing.

Do you sell this component? And if not can you provide me a part # or alternate supplier?

@paul.

Sorry to jump in on your thread, but it sounds and looks as though I may be looking for the exact same slider part. My linear dimension is the same 1.25", and width is .75". (See photos).

Will the 87-201 work ?

Thank you.

I have the same issue, do we know if the 87-201 is a suitable substitute?

This house was built in 1987. I ordered one pair to try and it does work to cut off the end pieces. Then take a file or course sandpaper and clean them up. Mine snapped right in. I will order more now that I know they work.