That's just angle-iron that I bent up and painted white which made pretty good brackets.
I used the original holes that poke out the side of the pockets.  The handle is clipped on
to the jack, but the blue bungee helps keep things from rattling.  The front mount is basically
a square shaped loop out of flat iron that it slides into, the rear is just angle iron where I lined up
holes between the bracket and the bottom of a jack and ran a bolt and wingnut through.  It works.