I dont want to have to re-solder the buttons back on so all i want to do is clip out the top of the buttons (coloured bit) and replace them with black buttons.
In the words of an alcholic, have another drink!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Looks like Seimitsu PS-14-GN (the button hole width is 30mm, like all standard mains). However, all standard Japanese pushbuttons use the same size .110in terminal so if you choose another model it's no problem (unless it's soldered in, and you can't solder, that is).