Racing 5 point harness on stock cars?

How do I attach racing seatbelts on stock cars without building a rollcage?

To the rear shelf behind the back seats. That's the correct way to install 4 points on a street car. Other options are down to the rear seats where the stock seat belt clip is located. Don't reccomend that for real life applications.

In my Celica, before i removed them, they were attached to bolts that I intalled in certain significant structural points in the car.
Brian