The "Trackpack" roll-bar was a double welded-in diagonal bar which fitted under the traditional hood. I think that it was made by "Safety Devices". I had one on my Sport Competition but it was dangerous when used without a helmet and impractical for road use because it made access to the limited luggage space even more difficult, (although it did improve the handling by stiffening up the rear of the car).
A single diagonal bar as supplied by Techniques is probably a better choice.
