My body lift comes in on Friday, so now I'm going to be buying my rims and tires.

I have my Torsion bars Cranked, and have a 3" PA body lift coming..
What backspacing do I need now?
I'm looking at the SideBiter rims from Mickey Thompson.

Tires are going to be 33x10.5x15's bfg M/t Km2

What's a good back spacing for me I do baja my truck.

or should I go with the 33x12.5? I'm not sure, I don't really want to worry about rubbing,
and rim width, should it be 8" wide or 10?

rim needs to be at least 8" (pref. 10") if you are going to go with a 12.5" tire. I would still run an 8" rim for the 10.5" tire you wanna get. As far as backspacing... I would look at the stickied links above to get your answer

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15x8 and 33x12.5

10.5s are gonna look narrow in my opinion. I once was convinced i was going to get MT Sidebiters and now i look back and think WTF was i thinking? make sure you see them on a truck before you buy them. they look cool in the pictures but they dont always turn out good on the truck...

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2007 Black FX4
Nitto Terra Grapplers - 285/75
Mickey Thompson Classic II's - 17"

How do your 33x12.5's fit? youve got just a 3" BL don't you?

When you go bajaing do you rub at all??