You ask: Why do I need this. Good question - the answer is pretty simple. After riding for more than half an hour (pick a time here...) and with the engine off, carefully, place your ungloved hand between the muffer and the side bag and feel the temperature of the bag (careful!). Abnormally hot, right? Now, look in the bag - anything melted? How about the same side turn signal or reflectors - they ok? That's why.
Add a shelf to hold those "extra parts" needed to get on down the road - as stated, these are model year specific and are available with or without shown equipment holes.
Add a pair or more of these luggage mounts - simple install, just replace the existing hardware with these mounts. OH - I suggest replacing one at a time to hold rack alignment.
This is a rare item - attaches to the rear frame to support the left side bag. Has a rubber bumper to meet the bag. $32 USD, (R1150GS is $28)
This is a rare item - inserts into the lower frame to change the sound of putting the sidestand up (CLANG!) to a reasonable 5am departure sound of "thump". This is model year specific and installs with "lightly inserting" the bumper in the frame and securing with the lock screw. $22 USD
More to come...the shop minions are getting inspirations.... & are hard at work....