I'm not sure how they would go on a 34 - you're welcome to come over and see if they fit.
Here is a link to a forum thread about wheel sizes & offsets for Skylines - if what I think are the offset details on the front mags is correct then there's a good chance they'll fit
As for painting them, there are some guides in the DIY section that cover painting mags - doesn't seem to be too hard a job, more a test of patience
Here is a link to a guide on these forums.