MK107 Running light kit

I have recently purchased a Velleman MK107 RUNNING LIGHT kit. I am wanting to change the 5mm LED Bulbs from the one,s supplied to a different colour of bulb i.e. (5mm Bright Blue). Can you tell me if any 5mm LED bulb is ok to use or do I require a certain type, i.e. low voltage. If so can you give me correct spec to allow me to order.
Regards John

Should work fine. Adjust series resistor value if necessary. Sorry, no values. Please experiment.