The CX650ED has a single shock absorber at the rear;


The part number is 52400-MG0-003 or 52400-MC5-013.
The total length when removed from the bike (as we measure it) is a hair over 31cm.
From the center of the hole in the clevis to the center of the eye is 29cm.
Note, this shock is different to that used on the CX500EC.
Once we get the equipment to do so, we will have a disassembly writeup.
For alternatives, see this page.