custom wheels backspacing question

EVRXXL

New Member
Apr 22, 2004
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I am ordering a set of Billet Specialties SLX37 (or SLX45) for my 2004 Mach 1. I intend to go 18x10 in the rear with a 285/35/18 tire and 18x9 in the front with a 255/40/18 tire. The Billet Specialties wheels offer custom backspacing in increments of .25". I want everything to sit perfectly, nothing sticking out and no space unfilled. Does anyone know what the correct backspacing for the front and rear would be??? Thanks.
EVRXXL