My 1957 GMC 150 has these.
I always assumed that the Chevy and GMC cabs were the same, with very minor differences.
I wonder why GMC cabs got these and Chevy did not.
"Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me either. Just leave me alone, you're starting to freak me out."
1957 GMC 150
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