My Metuchen built 10-2-68 Mach 1 has all kinds of weird things. There is a Spot Weld Tip attached to the rear underside seat bracket, I found about 50 build sheets dumped under the carpet and as seen in the photo a extra cut by the brake booster, just folded over and attached by a thin piece. A guy told me the PV, power ventilation was a rare option.