Okay so heres the rundown of what I'm looking at wanting to get. First off I got a stock 2006 F-150 XLT 4x4 Ext. Cab. I am looking at wanting to either put 17" or 18" MOTO Metal 951's on. The question first off is proper bolt patter dimmensions. and what type of backspacing? I dont really want when the tires get put on to stick out too far. Also what size of tire can I go without having any rubbing. I will be putting a 2" leveling kit on this truck as well before the new wheels and tires go on.

 

Your bolt pattern is 6x135mm. I believe the 18x9's are available in three different backspacings..... 4.5 which will stick out 2.5 inches farther than your OEM wheels, 5.7 which will stick out about 1.5 inches farther than the stockers and 6.1, which will stick out about an inch farther than your current wheels. I'd go with the 18x9 with 5.7 inches of bs and a 305/60-18 (33x12.50) or 325/60-18 (33x13.00) tire.