This being my first rod alot of things are new to me. I recently installed a mustang II front end under my 28 Hupp, and after looking at different options in replacement control arms, I noticed you can buy 'narrowed' control arms. My question would be what part of the control arms is narrrowed (the width)? Also, what do you gain with narrowed control arms? Eliminating tire interference with steering? Thanks for the info.