Hi Paul,
My Harrison has Vintage Wheels Inc knockoffs mounted with Sumitomo's.
Fronts 17 x 8.5 with 5.00 backspacing
Rears 17 x 10.5 with 5.00 backspacing
I have the fabricated IRS so may not be valid for a Nissan rearend. The knockoff adapters may also screw up the measurements
Cheers