something that took me a while to really understand are backspace and offset are essentially the same thing.
Backspace is easier for me to figure.
The offset is basically how far from the center of the rim the mounting plate is.
An 8 inch rim with 0 offset is essentially 4 inch backspace.
You can get the adapters that are not hub centric and the bore won't matter. It will also make it easier if you decide to switch to a different rim later on. Many guys run them with no problems. Mark can get them for you if you let him know when you order.
From what I can tell that Toyota rim is 7.5" wide with 4.75" backspace.
http://www.fjcruiserforums.com/forums/w ... space.htmlour rim is 7 inches wide with 6 inches of backspace.
If I take rim width - backspace 7.5 - 4.75 = 2.75 of what I call "front space"

If I add that to the width of your spacer (1.5) that gives us 4.25 inches sticking out.
Our stock rim has (7-6=1) 1" of "front space"
The Toyota rim will stick out 1.75 more than our rim.
You add the width of the wheel spacer/adapter of 1.5 inches and you get the new rim sticks out 3.25 inches more than your stock rim.
That is if I did all my math right.