The hugger is also a chain guard, so you should first remove
the old chain guard. To be able to remove the front screw,
remove the left footpeg (left, seen from the position when
you are sitting on the bike). This way you can reach the front
screw which holds the chainguard. Also remove the right footpeg.
Don`t disconnect the brake hoses or anything, just remove
the pegs to get a little more room to install the hugger.
The hugger doesn`t fit right on. It needs some modification.
We start with the left side. Try it on the wheel and see how
the left side holes are positioned in relation to the holes
where the old chainguard was mounted. (the hugger comes on
the outside of the brakes torque link (bar). If necessary,
drill new holes into the hugger to be able to mount the hugger
on the same places as where the old chainguard was mounted
onto:

Image 1: Green = old
holes, Red = new holes. Right old hole has been leveled off.
When the holes are drilled correctly, screw the hugger back
on the swingarm. You`ll notice that the rear side (backside)
of the hugger is pushed too far to the inside. This causes
the hugger to hit the wheel. To prevent this, add a washer
between the rear swingarm mounting point and the rear of the
hugger. This way the rear of the hugger is pushed outside
a bit, giving the wheel more clearance to rotate freely:
(click image to enlarge)

Image 2: The
front mounting point.
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Image 3: The
rear mounting point with the washer.
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When this side of the hugger is mounted onto the swingarm,
see if the hugger needs any other modification. I noticed
the brake hose on the right side of the swingarm needed more
room to move freely, so I removed some material from the hugger.
The torque link which holds the rear brake caliper is positioned
at the inside of the hugger. So the hugger covers the torque
link (see also image 6). Remove enough material from the hugger
so non of the hoses, wires, torque links hit the sharp edge
of the hugger, otherwise they could get damaged. Also make
sure the wheel can move freely.
The Bandit has it`s torque link (the bar which holds the
rear brake caliper) at the bottom of the swingarm. The GS
has this bar at the top of the swingarm. This shouldn`t be
a problem. Just push the hugger over the bar and modify it
if necessary (see image 6).
Bandit huggers are mounted on the swingarm with 4 screws,
2 on each side of the swingarm. Because we don`t have any
mounting points on the right side of the hugger, we shall
use hose clamps (I use them all the time). I used hose clamps,
because I didn`t want to drill any holes into the swingarm.
Remove the hugger from the bike again and make 2 holders on
the right side of the hugger to attach the hose clamps to:
(click image to enlarge)

Image 4: The
inside of the rear attachment point.
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Image 5: The
inside of the front attachment point.
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Image 6: Rear
view of the hugger.
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I used "mecano" metal plates (construction toy
for children) to make the 2 holder plates. It looks a bit
messy, but when it`s mounted on the bike you won`t see it
anymore.
Now that we have 4 points to attach the hugger to the swingarm,
we can place the hugger back onto the swingarm. Secure the
left side of the hugger the same way as you did with the old
chainguard. For the right side we use the hose clamps. Bend
the hose clamps in a rectangular shape, with the screw pointing
up on the outside of the swingarm. Put the clamp all the way
around the swingarm and through the attachment plates on the
hugger (like the red arrow in image 3 say`s). Put some rubber
between the hose clamp and the swingarm to protect the paintwork.
Now tighten the hose clamp until it`s firmly secured:
(click image to enlarge)

Image 7: The
front attachment point.
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Image 8: The
right side swingarm with the hugger. 3 hose clamps,
one to hold the counter of the digital speedometer.
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Image 9: The
rear attachment point.
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Check if the rear wheel can still move freely. I had to put
a piece of metal between the swingarm and the attachment plate
(image 5), because otherwise the hugger was pulled too far
to the right side which caused it to hit the wheel. Double
check all the connections and hose clamps! Be a 100% sure
the hugger won`t hit your tyre or cut your brake hose!! I
sealed the brake hose with some extra rubber to be sure it
wouldn`t get damaged by the hugger or one of it`s screws (see
image 7). When the hugger is secured, remount the footpegs
and there you have it: A rear hugger!