you can order peices of the joysticks from happs, when i first bought mine i bought 4 way on accident, so i just bought the bottom actuator and the plate above, just goto the page for hte jstick, look at the exploded view and you can see the parts that vary slightly from one the other.
i think i have what you need seeing as i went from 4 to 8 on some happs ultimates, email me if interested
natty@cosmicbreaks.com