really fix it? or just hack it in? if you want to hack it in then epoxy it or jb weld it. it won't come off for a long time. Now to really fix it like the factory you need to get some glass setting tape. I typically use the 1/32 style since my quarter window channels are tight. (total of 1/16" when C channeled for fit) not the 1/16" which of course doubles to 1/8" when c channeled but yours might be slightly spread open and the larger stuff might be better . clean the channel of tape and goop. slide on the glass and decide if it's 1/16 gap or 1/8" gap. go from there . Amazon.com: glass setting tape
