Summit's "Torq-Thrust" in a 17...

I know someone was talking about them here but I can't find it. Would like to put some of these on da' Dusta. Would like the 8 inch on the front and the 9 on the rear. Which backspacing was used by you guys that went to a 17??? I guess this is gonna make me get off of my @$$ and get the leaf spring relocation kit installed that's been in the trunk for 2 years!