15" 6 lug Wheel Help

[blackbomb]

Reposted: Accidentally put it in the suburban section by mistake

So im new to the site not too good at the search format yet. I have seen a lot info out there about the 6 lug wheels, but still had a few questions.

Here it goes i jus bought a 68 c10 with 15 inch 6 lug wheels. They are currently painted black and the truck is royal blue. It has the bigger center caps on the wheel now too. What i would really like to is put a set 17 inch mags on it, but according to what i have read you cant do that because of the center hub bore size. So now i am thinking of painting the rallys back silver, leaving the beauty rings, but i would like to find either a smaller center cap or a full cap like a "rally" cap to cover lug nuts all. Is this possible? What issues are there? Whats available out there? Thanks