The driver's A pillar had a plaque held on with pop rivets starting 3/69. When the plaque under the hood moved from firewall to the fender not sure. When the factory heater blower was added to the right side of the firewall the vacuum switch for 4WD moved towards the center. Believe this was the reason the plaque moved from the firewall to the fender. All early firewall plaque were held on with machine screws while all fender plaque were sheet metal screws. My 68 used four screws. Think it was 75 with the change in plaques it switched to just two.