I saw these in use by Bob Marks at Roundup #39 in Lincoln, Nebraska in July. They are available from Summit, https://www.summitracing.com/parts/mtd-340003. These are the real deal and positively the best way to tie down that I have ever seen. I just got my set today and verified the fit. The picture shows where they go. Simply place in the slot and turn them 90 degrees. The slot is in the reinforced area where you would normally either jack the car up from or place 2 post hoist pads. I had a couple other items I needed so I got to the free shipping threshold.