police style strobes

i have a setup with the very bright and powerful police style strobes( with the multiple plugs for different colors) i have the full set up including main power box, the huge gray wires goin to the strobes, but i only have the red and white bulbs. the blue ones are missin. these are very bright and were in my car when i bought it but i cant use them now. i will let them go for $50.