I am going to go out on a limb here and speculate , I think the 1972 STP cards were ony given out at a STP tent at the Daytona speedway. The only cards made were STP sponsered drivers which would explain the drivers selected. Im sure some drivers like Petty were major sponsers and other drivers were associate or minor sponsers by STP. As far as the Lorenzen cards being so scarce I think his sponsership was pulled befere the race. I have no proof but this makes sense.
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