From what I understand, the pre 60,000 cars had the sheet metal (wood screw) type on the dash capping and the doors, and the machine screw w/nuts around the rest of the car. On the post 60,000 cars, they used the machine screw type on the doors also, therefore the only place that had the sheet metal type is on the dash capping. I also believe that originally, the two pegs that go through the hood (top) webbing piece were longer then the other machine screw pegs. IIRC, the ones I used were all of the longer length.