Just spotted this thread.....I have the identical style rack on my Plus8. The “pin mounts” for the overrider fixing points are slightly different but similar.
The central bar is hinged to help sidescreen storage.
Beware!
The end screw can work loose and could drop out and get lost.
There is a hole in it to use a tommy bar to tighten it.
Do regular checks on it..a simple tweek with your fingers will spot it coming loose.
I have put Loctite on mine as there is enough room to drop the side screen bag down from the top, parallel to the spare with a small wiggling without removing this central bar.
I first noticed the screw loose when searching for a rattle in the back.
Stainless nylocs torqued enough to secure the pivot points with slight resistance makes sure less chance of loosening but allowing easy hinging to get at the spare.
