I think those are 2 if not 3 yrs old Flux RK30's He just uses an adapter disc and they bolt right to the board
Ohh! I thought you HAD to buy burton bindings only for burton boards hahahaa. i checked out reviews on the hate and the arbor draft. I think i definitely like the hate over the arbor as well because it has a softer flex. Sounds more fun for butters and jibbing too!
Oh by the way how much does your son weigh and how tall is he?