test fit glass to opening
use new soft rubber
test fit new rubber, mark center
lube new rubber with dish soap or tire mounting slime around the outside lips, something that will come of with water and not damage paint
center windshield without rubber and use tape or grease pencil to mark the body and tape to mark the center of the glass and the center of the body
install the rubber on the glass
install a cord/rope in the lips of the rubber, around the outside of the rubber, so the ends overlap at the bottom of the glass
lay the glass/rubber/cord into the opening, have help.
have helper press firmly, but not point pressure hard enough to crack the glass, so the lips of the rubber can be "started" over the metal lip on the cab opening
once the lips are over the steel, have helper(s) firmly apply pressure while you pull the cord from both ends. slowly. the cord should pull the lips fully over the steel cab lip as the cord is pulled around the glass and comes out of the rubber. be careful with the pressure from the outside because too much will crack the glass, especially when the glass gets started into the curved area.
watch the video below, maybe help you.
https://www.hotrod.com/articles/how-...nd-rear-glass/