I plan on bagging my truck in the future. right now it is lowered 4.5 inches in the rear and i have had it lowered 6 inches but the rubber on the factory 20's are very close and will scrub the fender lips if i drove the vehicle. So i am planning on purchasing some 22in boss 330's but have no idea what back spacing or offset i need to get them to tuck with the tires. If anyone has had experience with this problem please feel free to give me some info and advice.

The boss 330's may not fit but im sure i can find another set that is similar in style.