I’ve got an 18” ’91 Stumpjumper Comp frame and forks in need of a repaint anyway. Someone on here will be able to tell you if it’s the same frame as the ’92.
Ill PM you later if your still interested there is a seatpost in the frame I haven't attempted to take out so imagine its sized.. but if your going to strip it and way might be able to remove with gallium liquid to melt out the alu seatpost