Older aluminum window frame sliding components

Good afternoon. I'm trying to locate nylon guides (2 lower guides use wheels) to refresh some 1980s windows. The picture attached is of a worn out lower guide with the wheel. Next to it is a removed guide sitting atop the frame. Overall length is 7/8", the body insert width is 1/4" with a top flange width of 1/2". Anything like this available? Thanks for your time & assistance.

Thanks for the response to my previous inquiry & plan to order the 87-168 replacement rollers. But these same windows (from about 1980 or so) were supplemented by second interior window (to offer better winter insulation) which has no rollers. These windows simply have two rubber like bumpers that act as bottom slides/guides. The two rubber pieces fit into the lower window frame measuring 1/2" across in the channel, 3/8" in length, about 3/8" depth into the channel. Any idea as to what they are as I'd like to get some these as replacements.


Good morning. This has NO wheel, simply a hard very dark brown hard piece of plastic inserted into the lower window channel, two per window acting as a slider/guide.

The lower portion which rides & slides within the frame (like top of a inverted capital T) is 1/2" in width, length 3/8", & frame insert (upright aspect of T) portion is about 5/16" in length/depth & slightly wedged shaped at about 3/16" width where it adjoins the cross portion down about an 1/8".

Thanks for your assistance!