c-50 rims

[oldno7]

http://67-72chevytrucks.com/vboard/a...1&d=1365982312 So a few ?'s for you guy's. I need confirmation that these are not the dangerous rims. The rear say 8.5x20. I thought a while back i read that the stock 20 inch wheels were hard to find, but i cant remember if that was for the c-30's or c-50's. Also im not trying to sell here, but im thinking about parting this c-50 and just curious if these would be worth anything