Custom bolt in Harness bar with Schroth 4 point harness $1,000 plus shipping.
Used it a few track days at daytona and sebring. East to install and Uninstall in about 10 minutes or less. Less than year old and bought harness from HMS Motorsport. Paid $1,000 alone for harness. It's a clam style so you make it 5 point if you want (has hole at bottom to add additional/sub belt). Makes a huge difference on track as it hugs you in.