Question on Rims??

[Newold65]

First of all just want to say thank you to all those who post on this site. You guys are a wealth of knowledge. Now my question is this I've got a 1965 chevrolet 6 hole drum that I want to put a 2005 chevrolet rim on. Only problems are the center does not clear, and the lug nuts I need to use to attach the center caps don't fit either. I've heard I can purchase a wheel adapter but don't know where to get one or even exactly what it is I'm asking for. I know they aren't 20's but for 100$ I think they'll do.Thanks in advance.