Need Help Choosing Wheel Offset
 

I have an 06 Sierra, extended cab. Going to a 2/4 drop with 20 inch wheels. I have my eye on the American Racing Patrol wheels, but they only come in 12mm offset it looks like. I was thinking I needed 18mm, but I am not sure. I have read a lot on this already but couldn't find any visual reference of lowered trucks with 12mm offset wheels. The wheel is 20x9

These are the wheels: http://www.americanracing.com/wheel/43900/ar926-patrol


I liek the look of the Declad wheels, but I know those are 8.5 width and 31mm offset

Looking for look similar to this: https://www.performancetrucks.net/fo...025_163206.jpg