or can take out the regulator
I have an 87 SDL (same body as yours). I was able to take out the motor / regulator. I think it was three bolts holding it to the door. I had to trace the wires up to the switch. Open the junction box and the wires come out. I had to unbolt one side of the channel that holds the window in place also. The regulator and arm came out then. Drilled out the old stud, put the new one in place. You can setup a spot to carefully mushroom out the head. Carefull not to crack the plastic did that once 8^( . The biggest problem was getting all the door trim back on and aligned right.