Yes you will. You will need the quarter glasses out of a non-vinyl top Cutlass. The reason is that the vinyl actually tucked in behind the quarter glass on the vinyl top cars and therefore the outer sealing edge isnt there as it is on hard top models. Ill post a pic of the difference later after I return home from school and the alignment shop. There is a significant size difference between them that I will measure for you as well. The other thing to keep in mind is that you will need the rear trim off a non v top g body for the rear window. You will not have the mounts to install the mounting clips for the trim on a v top car. These are little studs that the mounting clips slide onto, there is a vendor on our board that sells the screw in version of these for around twenty dollars. You will also have to grind down the rivets that hold the front trim piece and quarter trim pieces in place along the outer edge of the vinyl top. There will also be an exposed seam where the rear quarter panel was mated to the roof. That will need to be filled in with fiberglass, bondo, what have you. The B-pillar behind the door will also require some filler too as it seems to sit a little lower and be a little rough on the vinyl top cars after the top os removed. The rear body filler, piece between the back of the trunk lid and the rear window will have holes in it as well from the vinyl top. You can get one of these at a u pull it for around 5 dollars off a non v top car or fill the holes on your old one with fiberglass. More later or as needed.