The RAM part number is "RAM-B-367U". This mount is designed to attach to handlebar clamps with 8mm bolts. Three different lengths of 8mm 8.8 bolts are included -- which you won't need for this project.
The other parts for this project are:
1 ea. - 5mm x 65mm stainless steel Allen cap screw
1 ea. - #10 x 1" (long) x 5/16 OD aluminum spacer
4 ea. - 5mm stainless steel flat washer
2 ea. - 6mm or #10 stainless steel flat washer (SAEs tend to have wider flanges)
I needed to take a rat tail file to one end of the spacer to get the cap screw through. It was more than just a little metal from cutting the spacer -- that end of the spacer just had a smaller ID.
As you might deduce from the pictures:
-- remove the stock black 5mm screw from the middle windscreen support.
-- Load two washers (5mm, then #10 or 6mm), the spacer, and the RAM ball onto the cap screw.
-- Load the remaining four washers (#10 or 6mm, followed by three 5mm).
-- Dab of Locktite.
I used the short RAM arm (RAM-B-201U-A). I discarded the wing nut in favor of a 1/4-20 lock nut. I tried the locking knob before and it rattled like mad when locked (which leaves the knob loose). I keep an 11mm ratcheting combination wrench (or use 7/16") in the scooter and this works much better than either the wing nut or the locking knob.
View of installed RAM-Mount ball.
Slightly different view.
The parts. The first set of washers and the spacer are loaded onto the cap screw.
Mounted with GPS in place.
Stepping back for a view of the cockpit. Old mount can be seen on left windscreen support.
Driver's view. (The power cable was later secured to the windscreen support.)