Re: RG 920 Premium custom build
It will fit, and intonate, but depending on the bolt pattern (and the accuracy thereof) you may need to dowel and re-drill the mounting holes.
I am unaware of if the Premium mounting holes correspond with the normal indonesian pattern, or the Korean/Japanese pattern.
It used to be that indonesian instruments used a different layout than japanese and korean, but since Premium is so different to normal indonesian runs, it may have either bolt pattern. I haven't seen confirmation either way, but I'm sure someone here has.