I don't know who is selling Super Tiger now.. but Tower use-to but they don't have the parts you need, you can buy a Perry Carburetor, Tower's have some of them,, or maybe buy a Kavan Carb from MECOA
MECOA,,
http://www.mecoa.com/acc/carbs/index.htm,
NOTE) my friend had an old Super Tiger 90 (made in Italy) and he had an OS 108 3 Needle Carb on it and it ran very, very well,, also know that there are many OS 70 and 90 Heli 3 Needle Carbs F/S out there, and I would bet they would work well too
Jim