Comp Pro extra micro switches

[xubidoo]

hi ,bought a Competition Pro Extra Joystick from a flea market and while it sort of works ok id like to replace the switches.
its a Competition Pro Extra Joystick Clear version with microswitched fire buttons instead of leaf springs. It also has a 3 way autofire switch at the back
But having a problem finding the type i need(never done this before)
the only writing on the switches i can find yeilds no results .

 

Fire Button (Blue switches)
MG2c20
Direction Switches(Black Switches)
no numbers,just says- Acehall Zero Plus on them.


If anybody can point me in the right direction it would be a great help , many thanks