Broke window yesterday

I broke the right(passenger) side door glass yesterday. This is a 72 dart hardtop. After cleaning up the glass and taking parts out,how does the lift bracket rivet come out? It goes thru the glass to secure it . Is it replaceable ,if so where do i get one? I dont have the glass yet ,but want to get things in order. Also after cleaning out i found a plastic(?)expansion plug. It has a phillips head screw to tighten it down. Any ideas where it goes?? I find no holes for it to go into.The shaft is about 1/2" diameter