When I wanted to attach our new Brandrup utility bags to the back of the passenger seat, I figured it would be a simple job. It is. As long as you know how to remove the headrests.
In our version of teh california (VW T4 Westfalia California Coach 1994) tere was no lever, as mentioned in the instruction booklet. I had to remove hard to see locking clips. Which is easiest using either a knife or a flathead screwdriver.
The locking clips are in the black plastic part of the headrest that are placed around the metal rods of teh headrest.
Make sure that when you put them back in place, the straight side is positioned to teh front of the vehicle.