Grind off a portion of either the caliper or rotor to get the caliper to fit? I'm installing vented discs and 4 runner calipers while doing my mini disc conversion. The holes are close but obviously not close enough. about 1/8" is all I need. I have trimmed the rock shields so it's clear. what else can I look for? I measured the mounting holes on each part and they will line up there is just something impeding the way.