I know it's possible to fit a GSA tank to a GS, and that it's a bit of a pain, but has anybody got a link as to what is required please?
honestly, just buy a GSA - it'll be cheaper.

It's just a straight swap, no real pain involved, well except the eye-watering price of the GSA tank. If youre swapping internals over too you can bend the float arm slightly to correct the fuel gauge. some say its best to get a new sealing ring if youre doing this (personally ive reused them several times without issue) and careful not to strip the little threaded studs.
As gog says, it's a straight swap. I got a bare tank, so reused the internals from my standard tank. I was able to get hold of 'adventure' float arm which, although a little fiddly, is also a straight swap so my fuel reads correctly
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Excellent, thank you.
I thought there was a crossover tube or something?
there is, but if it doesnt come with the tank, its just literally a simple crossover pipe with a quick disconnect in the middle. slightly narrower ID than the main fuel pipes IIRC.
I didn't get the balance pipe when I got my tank so made one up with QDs at either end, accessible from the sides, so that the balance pipe stays in situ when I remove the tank. That way I don't have to feed it under each time.
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I just picked one up yesterday for £299 ��������

As others have said, it’s an easy job but I still haven’t changed the float in mine so the fuel gauge works![]()