Replying to Old school fks that mount onto a riser??

so a few months ago at a ski swap i picked up some old skis with these old fks 14 din bindings on em. I hadn't looked at them very much till today and upon taking them off the ski I discovered that the binding itself mounts onto a plastic riser that is probably like a quarter inch thing (the screw doesn't go into the ski at all just the riser thing) and then the risers mount on to the ski, the toe piece with 4 screws really far apart, similar to the heel pattern of the px stuff, and the heel riser mounts to the ski with 5 screws, 4 normal fks holes and one like 3 inches down the ski towards the tail.

anyone used this system/is it any good??? I dont want to have risers on my park skis, but I'm getting some ep pros and might use them for those since the insanely large mount pattern would make them pretty dern hard to rip out.

thoughts...