Need Rims for my 2500. Sizes???
 

The stock wheels that came on my 2015 RAM 2500 are UGLY covers. I want to upgrade but stay close to the original size to maximize efficiency and fuel mileage. Having a really hard time finding the 8Jx18, ET43, 8x165.1 original size. How much can I deviate? Is 43 really the offset? How does Backspace come into play?