Man I'm not sure but on a side note I did just get new tires that are OEM size and as soon as I got them I realized that I wish I would have lifted and went larger, where are you located? If it's anywhere near NC I would be interested in selling these. They were right at $800 and I have about 600 miles on them.
My truck is also a 2007 fj with stock rim's so they will certainly fit.
Correct. Would have to be pre-2007 Tundra. Those were 6x5.5 bolt pattern.
In general, 4Runner and Tacoma wheels will also fit if they are 16" or larger.
Some have used 20" wheels but most of the time they are with much larger tires on 6" lifts just to not have tiny rubber-band street tires. You might look into the 20" 4Runner Premium wheels if you just want that street look. They may be a little tucked in on an FJ though.