
The Mk2 and Mk3 swing arms use sealed roller bearings. The Mk1 uses in sealed rollers an separate seals. Final drive ratios might also vary and Mk 1 had smaller needle rollers internally.
But the swing arm is identical casting so just go for it.
The snag with huggers is they don't keep much muck off the suspension. They are all too short leaving a fat gap to the spray guard.
I removed the spray guard and fitted a number plate extender and Mudsling. Result clean bike with less cluttered looking back wheel.
If you don't mind muddy legs ignore the Mudsling and fit a shock sock.
Iv found these two pics from impberger website looks like it'll fit a GSA ?

It will not foul the panniers - I have this hugger on mine (it's an early model ilmberger). If the 2007 has the breather on the FD it will foul that, I needed to cut a notch out the hugger for my 2011 GSA after moving it from my 2005 GS (realised after the FD filled with water from the breather being pushed to the the side).
, unless O wise Bendy clarifies..... FD Breather....TBH, I've no idea....will need to check, unless O wise Bendy clarifies.....
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It's a rubber thing sitting on top of the FD about 2cm tall and 2cm diameter from memory - certainly easy to see. If you have it, it will be around the middle of the edge of the hugger between the mounting holes when the hugger is on. It will look like it fits fine, and then in 1000 miles your FD will be full of water and pushing oil through the seals based on my experience!

I had an early Ilmberger on my 2008 GSA, it did catch the RHS cast alloy side case mounting block. TBH the Adventure top and side case frames really are an afterthought design. Touratech really should have done better.
You will need a rubber pad at the front of the hugger so it wont rub paint on the swing arm. The best solution is to fit the hugger and not where it catches. Take it off and stick a 2mm to 3mm rubber pad to the swing arm. I used number plate sticky pads. Grit will eventually buff the hugger but a better option than rubbed paint on the swing arm.
If it clatters like a dinner plate over bumps you have not got the buffer in the right place.