Reply to NanoKontrol LEDs

Been worrking on my plans for a super mod of my NanoKontrol for a few months. Basically going to put it in a box about 5 times bigger, arcade button it up and change all the faders into knobs. I want to keep the ability to change scenes as it's part of my mapping I'm planning and I want to keep the visual feedback given by the LEDs.

My question is does anybody know what LEDs I will need to use, as I want to have 4 different colours.