New Moto Guzzi Door Mats Available Now
I’m not familiar with those assemblies, but usually removing the assembly from the fender will give you access to inner nuts.
As far as I knew, (haven't needed to know for a while), the two pins to the back of the assembly are locator pins. The bolt in the middle near the front, (as you look at it), was the hold down.John Henry
There is a snap ring on each of those two posts. Spin the ring around so the open end faces you and push it off the post with two little screwdrivers.Larry