Tony if you buy the vac motor from solutions i comes with the holes already drilled. Then you just swap the flange over from your old motor. You can drill the holes your self if you buy elsewhere, it's up to you. Don't think its the same as that one of Amazon as that says 3" and your should have 1.5" internal hose on the scorpion. If you don't have the old flange for some reason i think i've got one knocking about somewhere i can send you.
Mark