Tim,
It may not have come through clearly in Fran's response.
He has TWO options available. The cable operated option that is used in the race car, and then another much, much less expensive option that is basically a moveable plate with several stops.
We need to facilitate a 5 inch difference in our car. . . maybe less if I wear heels

. . . and think the cheaper option will suffice for us.
Cheers,
Ruth