We even mount the alum seats with dzus fasteners. You build a front loop off the floor that supports the front of the seat out of usually 1/2 tubing. Also bend a loop off the rear crossbar from same tubing to support back of seat. Then you can also run some pieces of 1/2 tubing from rear loop to front loop, bent to seat contour. Seat is basically sitting in a tubing frame and mounted with dzus fasteners. With the belts mounted right, you could just sit the seat in the frame and it isn't going anywhere. This type mount can be built in ANY car with ease and is 10 times better than some bolts through the bottom of the seat. You can also mount a poly seat the same way, by cutting a large enough hole in the inner shell to mount the dzus. Just because a poly seat has some weak threaded inserts in the bottom, doesn't mean you have to mount it with them. With this setup, the seat sits in a cradle. VERY safe, VERY strong, VERY secure

Many ask "whats the point of the seat dzusing out quickly"......answer that question after you need to lay in the floor to work under the dash on a car with a cage