Thanks for the help. The 4 bolts that I am looking for are for the hinge, not the door prop (2 hinges x 2 bolts). The trap door is original and as mentioned the AMK bolt kit for a 65/66 Trap Door does not work. Bolts are over sized. I have one original and in appearance is the same as the AMK, but the size is different.
I'll order some more, maybe there was a packaging issue or other. Seems odd that they would not fit unless there was a early/late change to the bolt diameter.