Originally Posted by
BluesDaddy
A picture would help a lot in determining what you have and what can be done with it. That said... "SIS Light Action" is Shimano, so the bike is likely not French sizing. Any parts from Shimano made up to about mid-1990s should work.
Yes, probably, but if the seat tube is 24 mm, DO NOT LOOSE IT. At least, not if you can't match up the frame without the sleeve in place. Buying another one could become a significant challenge.