Russ!! Another Washington member!! :bearchug
hey man, i've moved this into the susp/wheel/tire section, so some other tire monkeys can help you as well.
You'll find a great deal of good info in Exar-kun's(Chet) info sticky pages. He's no doubt spent hours compiling them, so be sure not to let the information go to waste!
The 240 wheel hubs are 4-114.3(equals 4-4.5"), hub bore of 66.06, offset +40.
If you increase width, you'll likely need to get wheels with a lower offset. Rays wheels has extensive info online.
http://www.rayswheels.co.jp/e_index.htmlUnder the products link, you'll find every wheel they make, with fitment and specs for each.
For more specific info, check out your local tire/wheel retailers...I know of a few near Gig Harbor.....Discount Tire, Les Schwab, etc.