The 72 is a metal flaked Sporty with white walls and mini-apes. The Slim is a "50's style bobber" with a 103ci Twinkie in it. EPA, DOT, and NHTSA regs keep them from doing anything unsafe or unfriendly to the environment.
Good on them for trying I guess. Factory still doesn't equate to custom though. There will be plenty of hardasses piloting these faux choppers this summer.