Window regulator rivet

I'm about to remove the roll up windows from the doors in my 70 Swinger. There is a nylon attachment rivet holding the window to the regulator. Looks like I may have to destroy these to get the windows out. Has anyone had any experience with these? Year One shows a rivet in their online catalog, but it is not specified for my model of car?? (their tech help did not know either.) Appreciate any input. Howard