So I added some 3/4 spacers under a 2X4, giving a thickness of 2.25 inches, I have a 07 with a Corbin seat. The 5.5" dimension has a additional 3/4 " so 6.25 would also fit.
Picture 2 shows the red terminal to the left of , which is the battery, between the battery and compartment you will notice a tube running across, I have some 3/16 rubber wire tied in place to support the Corbin seat and prevent it from shifting side to side.
Picture 3 shows some white 3/4 foam in a storage area directly in front of the ECU, I doubt you would get anything 1" to fit, but you could put your tools here, one at a time, also the strap goes the long way, so you would need a second means of securing the tools if stored here.
Picture 4 is my brake flasher / Addmore lighting connections and trigger connection for the headlight relay, very top you will notice several wires, I added a longer stud and this is my frame ground with additions.
Picture 5, I added the 3/4 foam to the end of the 2X4 to show the additional room.
Last, I very much doubt the 2015
is different from this. As to the alarm system, this would be the ideal location---
----wrong again, well I tried
Best to read Eddie's next post