Jeff, your reference to the tune up decal and valve cover is correct. The hinges have never been replaced that I know of, the only time the car was ever worked on and it wasn't me was when relatively new and still under warranty. I had burned valve in 70 and a failed timing gear around 71, otherwise no one has been in the car but me. Interesting note though because I could not find a date stamp on that hinge but there is one on the driver side although very difficult to decipher as the stamping is poor ,legible numbers are 6D3 and those coincide with most other items on the car. Build date was Nov. 18 68 and I purchased it on Nov. 26th.