I found on your website part #87-175 Tomray Tyco 66 Window Roller 3/8 flat wheel which looks to be the same as what I have.
My window isn't sliding well anymore and I thought if I add new rollers it might help.
Bob from SWISCO responded:
April 3, 2020
Hey there. If the window rollers look damaged at all, then it may be worth replacing them. Just make sure the dimensions of the 87-175 absolutely match. Let us know what you find.