they are designed for CWB's park boards with the "8 up inserts" 4 hole mounting. so they likely will work with older slingshots in addition only.
the newer hooke?... you might be able to get it to work. I'M GOING OFF PICTURES AND VIDEO HERE, but here is my thought. the video shows the 4 hole pattern which is a bit of a rectangle if you trace the holes, ( http://ridecwb.com/product/cwb_prizm_wakeboard_boots
) lengthwise and widthwise with the boot. It appears and i assume the boot can lock into place in any angle within 360 degrees. IF this is true, then you should be able to use two of the holes DIAGONALLY to hold the boot down inside the slingshot fast track system.
hope this makes sense.
try to find some boots to try it with first before purchasing or some shop that has great return policy