So I am trying to find wheels that will tuck on my Dakota. What I know is that I need +42mm offset will tuck in the rear. Where I am having trouble is I am putting a new rearend on my truck that is 2" narrower. How much does this effect the offset needed. I did some calculations and got confused. 2" is around 51mm so would that mean I need around -10mm to tuck. I really don't want my wheels too far in or too close to the fender.