I don't believe there's any such thing as a Happ Competition 4-way. At least its not in my Happ catalog. If Happ sticks are your brand of choice then You could use a Happ ultimate with the 4-way actuator (part#95-1307-00). You could get a Happ Super which has a two sided 4/8-way actuator that you flip over to change modes. Both of these sticks will sufice as a 4-way joystick but there are better choices out there if you're looking for a "dedicated" 4-way joystick ie.classic Wicos,original Midway Pacman sticks,Happ Pacman/Galaga reunion sticks as well as 8/4-way switchable sticks from Ultimarc and Groovy Game Gear. To my knowledge no one currently makes a 4-way actuator or restrictor plate for a Happ competition stick. The Comp stick was designed as a dedicated 8-way stick and though it certainly can be done through the use of a homade restrictor or actuator it probably isn't the best choice for converting into a 4-way when there are so many better choices out there.