Re: '67 Stepper "Laymond"
I'm pretty sure the difference is in the caliper mount. Most, if not all, of the spindles have the caliper mount cast into the spindle, except the CPP Modular unit. My theory is that Wilwood uses these since their brackets will bolt right onto them. The factory style caliper mount would need to be cut off and holes drilled for the aftermarket caliper brackets, and most companies don't want to take the risk of a customer messing up their spindles and blaming them for it.
But, I don't know if that theory is 100% accurate.
I just bolted on a pair of the CPP Modular drop spindles. They're nice pieces. Moves the wheels in 3/4" per side, according to some sources. I didn't measure before and after, but I've noticed about 1/2" per side.
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