I found this metra harness 70-7002. Suppose to plug into amp harness and run wire to back of the aftermarket head unit. Anyone ever use it?
http://www.metraonline.com/part/Mitsubishi_wire+harness_70-7002
from what i can see from the measurement you provided. the passenger side is sitting a little back towards the fender side.im pretty sure the caster is being effected. which can cause a pull to the right. camber/caster kit may help. but getting actual numbers from an shop that has an alignment...