Snap-in Window Glaze

Windows were supplied installed on a 1990 RV (Park Model) orphaned by Sierra.

After 26 years, sun has significantly dried out the part on the glass (not the insert) on a multitude of edges. I have inquired of numerous sources and been unable to identify a source for replacement of the glaze. If you should have (or be able to identify) the attached, I could use about 50 feet to cover current and future needs.

Harris

I neglected to mention in the post above, I'm not 100% sure of the measurements posted in the picture #2. Given the amount of drying that has occurred over 26 years and the fact I was using a tape measure to take the measurements, I can only assume that they are "roughly right."

Thank you for any assistance.

It MAY hold the glass, but it looks to me as though the piece from the insert, is in the opposite direction. Away from the glass instead of towards the glass. The only thing holding the glass would be the extreme end.
In addition, from the outside, you would see a tunnel, not a flush look.
Of course, I may be reading this wrong, but if the portion from the insert went down instead of up, and was flush to the glass, it would look flush and hold the glass in place.
Thoughts?
Harris