The Corvette replacements and the Chevy backup lights will be correct for a '51-'53 GMC. They are not correct for a '47-'50 GMC.

Also, if I remember correctly, the Chevy backup lights use a different mounting gasket than the GMC to compensate for the curve in the Chevy body.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.