Dave, the car or more correctly the track is 3" wider. As the lower control arms were widened to match the rear it pulled the wheel forward increasing the castor and wheelbase. I need to double check but I think the wheelbase is now 91"

As for the rules that's not an issue as I'm in a catch all class. In fact I could run a full tube frame car under the rules set.

I also believe the A series goodies would recoup any money spent fitting an L18 or L20 post install.