I think Advanced Technologies makes one for the standard. I'm not sure, but I think they make one for the 10-22T (not 100% sure what the difference is).
Not sure about Choate either, but they do make a pistol grip version for the standard barrel.
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Trust is earned, not... GIVEN away. - Worf
Just to name a few. All of the aftermarket stocks should be made to fit the .920 diameter bull barrels. All you need to do now is contact the suppliers to find out if they offer lefty versions. The only difference between the "T" and the basic carbine 10-22 is the "target" hammer inside the reciever and the bull barrel. All other dimensions are the same.
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Nothing is foolproof to a sufficently tallented fool!