The backspacing is 6 1/2" from the mounting surface to the outside lip of the rim.
In this pic, you can see at the bottom of the photo where I clearanced the leaf a bit on the driver's side.

Pass. side. Sorry for the low quality photos, it was dark and the bed is full of junk, the hood, etc., the engine is being swapped. I will put wider tubs in later.

See where I ground the bottom leaf it a bit?

Yes I know the exhaust system is garbage. It was a $1000 running shortbed.
The left tire got tore up by stuff in the bed with no tubs. 'Doh!
