I'm looking at some Sparco Harnesses and I'm having a little trouble with the selection. I know I want a 4-Point. There are 2 different types of 4-points. One looks like it has bolts at the end of the straps and the other one does not. What is the difference? Which one should I choose if I am getting a Sparco Harness Bar and want to utilize factory mounting points for the "Lap" straps of the harness?