So while I wait to see what DC can do with their rubber, I went old school and cut one to fit. I taped it in place and let it sit in the sun on the truck for about 2 days. Then used 3m contact cement for rubber and joined the cut ends. I was able to mount the glass properly from the inside by myself with the help of some suction cups made for carrying glass. It took some soapy water and about 15 minutes. Worked great!