5 Point Harness

I selected M&R Tiedowns for my harness because I heard that they were excellent quality and a good price. The setup I chose is a 5-point system with wraps at the top (attach to current rollbar) and tabs on the other 3 points to mount through a mounting bolt. I also have the cam-lock mechanism and the optional sternum strap. I chose the sternum strap because I planned to use may factory seats which do not have harness guides. The setup was $130 ea. Also, I had a bolt-hole drilled into the tunnel at the Porsche dealer for about 1 hours labor. I chose this mounting to allow the future addition of a racing seat. Here's some shots of the installation:

The following shows the wrap on the rollbar and the location of the inside mounting bolt (just above rear of seat track). The best way to go IMHO.

Last, the mounting point under the front seat.  Under the front seat, a link clip was inserted into a hole that was drilled into the pan lip.