[twobjshelbys]

I had a long discussion with the folks at Shelby American. They should be attached to the roll bar (there is a bracket to do so) and you can get eye-clips. SAI asserts that they should be attached to no member with a radius less than the roll bar. If the cross member in the rear is at least that then go for it, other wise go for the roll bar.

Regarding the passenger side. They also state that they will NEVER install shoulder harnesses on the passenger side without a roll bar, regardless of attachment method. The reason is that if the car does roll, and there is no roll bar, a shoulder-harnessed passenger IS the roll bar (the belts hold you upright). The decision you have to make is whether the protection of the shoulder harnesses in the case of a front, rear or side collision outweigh the risk of a rollover. This was the final straw in the camel's back for my wife with the Cobra and she will no longer ride in it, even to the grocery store. I warn passengers and most don't use them.

I am having the same discussion right now on my Ford GT and there are some tracks that will only allow the regular 3-point belts without an interior roll cage. Some tracks take this very seriously but I am told the tracks I am likely to use allow the setup I'm getting. Your mileage may vary but that doesn't make it safe.

Most people will attach them to the tube across the back.