I bought one a long time ago that works the same way, its basicaly a flat piece of steel with 3 sides a couple inches high and a post on the bottom to go into the floor jack hole. Its definetly a life/time saver, I think it might be made by TCI.

68 Dart 410 / 904
92 D150 original owner
21 Ram 1500 Quad Cab, Big Horn , Hemi ,4x4
23 Audi Q5
16 Honda HRV