Vinyl push in stop?

We had the glass on our windows replaced recently. There's a "trim" piece that goes around the glass that shrank when they put them back. The glass company called it a "vinyl push in stop" and they said that the part was no longer available.

We found the attached AAMA certification label. I looked it up and it appears that the windows were manufactured by "Atrium Door and Window". It does appear that they are out of business. The house was built 1999.

I've included pictures of one of the windows for reference. Is there any type of glazing material or spline that can be purchased to trim out these windows? I'll be happy to get additional measurements or information if that would help.

Thanks

Guy 

Ok, I've pulled one of the glazing pieces, it appears to be made of a vinyl or rubber compound, and it an almond or beige color. The windows are aluminum.

I drew a quick sketch of the cross section with dimensions for reference as well as taking a picture of the end of the glazing.

Let me know if I can get any other information for you.