Just as well you only got the 8"x10" pad version then. The one I bought first and have on now is 10"x12" and even though they pivot forward a little for pillion access they do not fold down far.
The one Anthomy got has the 10"x12" pad as well.
Motorcycle Backrest - RED TRIM - for Corbin Seat Harley Honda Driver Passenger | eBay.
They do a 7" x &" version as well and the cheapest of all theirs
SHIPPED TO OZ is the carbon fiber 7x7 as for some reason the postage is 'only'

US $40.50 rather than US$62 for the rest including the other 7x7s.
This pattern may also more closely match the later Roadster upholstery.
CARBON FIBER motorcycle backrest for Corbin seat Harley Honda Drivers 7 x 7 | eBay