Wait -- so is this necessary no matter what, or only if toe cannot be returned to about zero?
Even if both points were adjusted independently, is the idea that having an extra region where you can make adjustments requires you to lock the other one due to changes in how force is exerted on the vehicle, which can cause one or the other to nudge out of alignment? If everything is torqued to spec, shouldn't it be fine?
I don't know about the SPL, but I though the SPC came with all needed hardware.
I don't think I understand...