I have been thinking about jazzing up the interior a little bit. I figure the car is red, so red harnesses should look pretty nice. I have only been in a car with harnesses once before, 3 point, so I can't form a practical stand point here. The ones I am interested in are 5 point. Do I loose the back seat use? Meaning do the top staps attach at the rear seat belt areas? The car I was in was a 4door A4. Thanks in advance.