Need help on wheel spacing

[zimmerman1408]

I own an 07 ram 1500 quadcab sport. Its black (PXR paint code) and has the stock 20" chrome clad wheels. I just got 2.5 Inch pocket style fender flares and i don't like the idea of putting spacers on the truck because i use it for work and towing. What wheel backspace and offset do i need to bring my wheel out 2 inches? I'm currently looking at wheels with a 4.5" backspace and -12 offset. Even if someone could tell me how far this would bring me out that would be awesome too. Any help or direction would be greatly appreciated. Thank you.

Btw I'm currently cutting bed sides off and replacing panels and painting it.

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