Technical Help with rim identification

Hello all, bought a pair of rims today and hoping for some help with identification. The tires are 5.25/5.5 x 18, the rims have a 6 bolt pattern. I don't have anything that they will fit but the price was right and they will look cool hanging on the wall if nothing else. Any help is appreciated. Thanks

 

Look like ones that were on a 31/32 Chevy I considered buying but that's only a guess at best.

 

I believe 51504bat is correct.

 

Thanks guys. Googling seems to confirm you suggestions. At least I can talk smart when someone asks what they are.