behalf off Deutscher Se7ner I have in my 7 no rear anti roll bar and will now retrofit one. The question is, what dimension would be the best? Actually I have in front a wide track suspension with 9/16” anti roll bar and nitron shocks. Rear as well nitron shocks and, as I said, no anti roll bar. Should I chose a rear bar with 1/2” size or 9/16” size (like in front)? My driving style is sporty, with very rare racetrack visits.