Have you ever seen the original build sheets...both of them?

[LILRED66]

The factory build sheets were provided on the back of the glove box door, as well as, between the seat springs behind the driver. I have a '66 Chevy K10 with the original build sheet on the glove box door and in the seat springs...still in amazingly good condition.

This information was also provided with the Protecto Plate and owner's literature, but both of these were actually attached to the vehicle, when new, so rather uncommon to still be in good, legible condition.