check choate, what style? try manners or McM possibly HS too but not cheap. B&C? there is a thread on stocks with like 10 different companies listed, search in ... gunsmithing i think it was??
Another option would be to take an adult stock and cut it down to the length you want. Fit a new recoil pad and you could add spacers to increase the length as needed until a full size stock fits. Most of the "plastic" stocks can be shortened quite a bit. (wood can be too)