Probably varies boot to boot, on my rampages i had to cut a hole into the booster strap in the same spot a screw passed through the original strap of the boot. Just attatch it however your original strap was attatched, might require a little ingenuity on your part.
i took off the old strap on my rampages and drilled new holes in them for the booster strap
"You put on your boots, click into your bindings, dust the snow off your skis, and head out for the chair, and it doesn't matter that you failed a test, didn't get the girl, or that your life is on a one way trip down the shitter, your world is right for the next couple of hours."
you dont even need to drill them on they stay on themselves. I had spks 2 seasons ago and I just ripped off the big strap they have and wore the booster straps without fastening them on, they never came off once.