hi i want to get harnesses for my car before i get new seats. because harnesses are so unsafe with out a harness bar i want to get the sparco harness bar. knowing by back seats are have minimal room already, will the harness bar totaly kill by back seats? and if there will still be enough room, which it seems as there would be would it be safe for the passengers in the back seat? i plan to get bride, cobra, or, chargespeed fixed possition seats if any one has any other seat suggestions with a fixed position i would love the input.