Hi, Busted the left hand side Rad hose at the weekend and looking for a replacement, would also be interested in a GasGas left hand Rad and some Rad Guards.
Your local auto parts store can fix you up. They have so many different hoses that it makes the shorter and somewhat straight GG hoses easy to match up. The longer GG hoses with the 90 degree bends are also easy to match if they have only one 90 degree bend. If your bikes longer hoses have (2) 90 degree bends don't worry you can buy 2 hoses with 90 degree bends and join them together with a coupler.
I have two parts bikes a 99 and 02 if you PM me a pic of the hose I can see if they are the same but I would check with the auto parts store like gasser suggests.
I have rads but they are not straight if yours are leaking they can be fixed at a auto rad reparebshop.