Hidden vin# on cab

[chebyshortbox65]

Hey guys i got a question i have a 73 cab and an 81 cab the 81 is a hood rust free cab and the 73 is or was a running driving truck the problem the 73 is rusted out so im going to use the 81 cab for the donar parts like the fire wall and such ad the firewall since its rusted is there any hidden vin# i need to know about on these two cabs like the camaro and chevelles near the heaterbox?any info is appreciated i know of the two on the frame and the tag on the cabs.
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