[DanEC]

My ERA ones have a loop that fits over the ball on the door latch release lever and the other end attaches to the underside of the door with a phillips head screw near the center side curtain bezel. I looked though a bunch of photo galleries of original cars and found a number showing the straps but none with any close up details of exactly how they were fastened on the original cars. Maybe an owner of an original will chime in.