resealing window glass

[TheOldMan76]

I'm in the process of pulling all the windows and resealing on my 1985 Alpenlite 5th wheel. I remove the window assy, clean thoroughly, along with the mounting area on the camper, install new butyl glazing tape on the frame, re-insert the glass and press in place, apply putty tape to the frame, and reinstall assy onto camper.
Here's my problem. Had a roll of 1/16" x 1/2" gray butyl glazing tape left over from and earlier project, but have enough left for 1 more window, and have 6 to go! Anyone know where to find this tape? Also, the rubber retaining strip that holds the glass in place has shrunk. I'm able to clean and re-install but come up a few inches short on each window. The only name I can find anywhere on the windows is "Janel Safety Glass". I've been told that one must have the correct rubber or it will not fit. Any idea where to find it? Gotta be another Alpenlite owner out there that has done this.

[CaptainGeezer]

I have heard of the rubber retaining material referred to as "rubber glazing material".

[bap]

you should be able to get the butyl tape at about any hardware store...or order from vintage trailer supply...