Ok I've read the theories on roll cages but I have a problem, I have bought a GC8 which I will be using 95% for track work so will not be using rear seat, the previous owner has fitted sparco seats & williams harness's but no harness bar, don't like the idea of using a harness without a cage. 2 options 1) fit a bolt in half cage with harness bar 2) pull out harness's & run with standard belts with sparco seats ?