i need pointers on replacing the small rear quarter glass on an 87 cutlass . the one that needs the glass has the vinyl top, but has already been cut . the donor window is in one that either has the top removed or never had it to begin with . I have changed glass in the past , just never these . Like any pointers or mistakes i need to watch out for . i really dont want to break it . Getting hard to find around here . thanks guys . im getting close to getting her together ....... new top and paint on the way ! 8)