If you do not have self-cancelling turn signals, backrest, heated grips and a centerstand; you do not have the deluxe model.
I do have a deluxe with these; I believe you may have to purchase these in order to make your non-deluxe capable of supporting a rear backrest.
https://www.hondapartshouse.com/oemc...carrier-silver
More detailed parts list (items 12, 14, 15 and associated fasteners):
https://www.hondapartshouse.com/oemp...db06db024/seat