So FYI for anybody wanting to purchase off ebay etc. The front lights are T10s and the back is a 31mm Festoon. I've replaced all of them them with 4000k (daylight white) narva LEDs which are similar to the ones in the previous post. I prefer a more natural colour and am not keen on the blue tint that is found in the 6000k LEDS.
When installing I found a slight issue with the back light. Although the navara bulb I purchased is a 31mm festoon which matches the stock bulb, the ends seem to be a slightly different profile so it doesn't fit 100% correctly into the slot. To fix this I'll probably need to put a small bit of electrical tape on the end point where it contacts otherwise it may fall out during a large bump.
stock:
LED: