Vinyl Window Snap In Glazing

I have a building with white vinyl windows and the sun over time has made the vinyl glazing strips brittle. These are fairly old windows, perhaps 30-40 years old and we have no idea who made these windows. I have attached a picture of the profile of one of these strips. It is best described as a P Shaped profile, but maybe you have something else that might work as well. I have looked up "P" Shaped Vinyl Glazing on your site and looked at some of those. We realize it will likely not be an exact match, but are hoping to get something that will hold the glass pane in, while the silicone sets up that the installers will use to replace some broken window panes. Thank You!