It looks like 68 to 72 are all the same. I swapped out my AC unit on the firewall with the AC delete box today. My inner fender is the plastic one and must be original to the car. At most of the mount points the fender was cracked and/or broken and I don't think even fender washers will take up the space needed to really hold this thing in place. I am open to plastic or metal and used is fine. Of course I had a couple spares a few years ago but sold the house and had to reduce inventory!