Wilwood and other companies do not design rear brakes correctly for Mopar applications. They consider axle flange stand out to be 1/8" less than what it actually measures because they never took into account the thickness of the drum brake backing plate when they "designed" the caliper brackets.

In other words, 5 x 4" bolt pattern A-body axles measure 2.1" from the inside of the wheel bearing snap-ring, to the outside of the axle flange. This is what they mistakenly call "offset".

BTW, as far as I know, I'm the only source for a rear disc brake kit that fits Mopar axles with 2.225" stand-out.