Thanks; I'll measure and see if I can make it work with my racing seats. My concern is finding attachment points - on my driver seat, the threads on the side of the seat are used for the bolts that attach the side mounts to the seats. No sure if I want this bolt to do double duty and attach my seat belt latch as well. Of course, at the track, I won't be using the stock seat belt - I'll be using the harness.
On the passenger side, on the other hand, I have a Corbeau seat I bought from Pablo Crespo, at it is attached to runners on the bottom of the seat, leaving the threads on the side of the seat free to use for the seat belt latch.
I'm almost done installing the drivers' seat (taking a lot longer than I expected). Once I have it in place, I'll see if I can make the latch work. If not, I'll buy just the one for the passenger side, and use the harness when I'm driving the car on the street as well. Not my first choice, as I don't like the fact that to be safe in a harness, you have to have it tightly strapped, making it difficult to lean forward, which is important with street driving (like at intersections). I'll report back when I have something figured out. But at a minimum, I will be needing one latch. Thanks.