I think all the parts houses have them, it's one of the older repops. From what I know, all the 1967-1969's had a tire pressure sticker on the inside of the glove box door. On the 1969's, it goes into the center of the three recessed "cup holder" depressions.
This is the 1967 version, from Ames Perf (their watermark is in the background).
