The s1 and s2 fuel tanks are different.

I had to changemy S1 fuel tank becuse the spout for the hose coming from the tank to the fuel pump had worn thin and fuel was seaping through.

I have a fuel tank in Glasgow, it' the above said fuel tank, it woul dneed cleaned out and the spout repaired/sleeved if this is possible. new ones can be bought but im not sure where from, had trouble getting one myself and got 2nd hand eventually.