[jmatta]

Three point is standard street belt that really doesn't work if purchasing a race seat. No one will allow a four point because they are outright dangerous. I suggest you look into a six point setup. You will need to purchase a harness bar for the shoulder belts and point attachment adapters for the lap/sub belts.

Talk to a good safety equuipment supplier; they should be able to steer you in the proper direction.