Here's the thread with the CPP offset chart.
http://67-72chevytrucks.com/vboard/s...d.php?t=529285
It says,...
Standard CPP Drop Spindles:
* 1/16"
wider than DRUM BRAKES.
* 7/16"
narrower than factory DISC BRAKES.
CPP Modular Drop Spindles:
* 1/4"
narrower than DRUM BRAKES.
* 3/4"
narrower than factory DISC BRAKES.
Also states at the bottom of the 73-87 chart that Western Chassis drop spindles are:
* 7/8"
wider than DRUM BRAKES.
* 3/8"
wider than factory DISC BRAKES.
Never on the chart does it say "per side" or "total track width narrower/wider".
If I had a set of the Modular Spindles,... I would measure them against a set of Belltech spindles I have and would put an end to all of this.