Yeah, the speed cases have sleeve hole bored out to accept the 46mm kitties.
Also, you really don't need to pay someone to do your stock case.
Just go down to the hardware store and get one of those grinding wheels that are made to attach to the drill. Make sure you get one at least equal to the outer diameter of the sleeve.
Then go to town.
Of course you have to pull the case apart then put the empty case back together, but its a lot cheaper.