My favorite stock wheels on 4runners to date are the 18" wheel from the '06-'09 limited ('08-'09 urban runner) that I had! I think there is a member that put these on a 5th gen.

Are they the 16", 17", or 18" Limited rims? The 5th Gens have the larger calipers much like the Sport/Limited 4th Gens so anything under 17" won't fit.
The factory backspace is differant , 4th gen have more BS, brings the wheel in.
So they will be even more further in than my current 20s? Will I have problems with rubbing?
I just want more tire than the factory 20s. The 20s deem the 4runner useless with the stock tires. I have a set of 17s off my last 4runner so I wanted to get some 285/70s and throw them back on the 5th gen.
I would measure the backspace and check for yourself to be sure but My 2005 sport wheels had almost 1" more backspace than my 2013 wheels. I installed them with spidertrax spacers and they fit but I ened up selling them and using the wheel spacers on my stock wheels and it looks much better.