Ratheruneeq

Im unfamiliar with messing around with HID setups.
What's the quickest way to replace a ballast? By that i mean whats the most affordable/quality ballast to get for the kb1? I imagine theres a specific wattage or grade? Any info or links? My passenger bulb has been out for a while now.
p.s. i started noticing blinking on the bulbs i had prior which prompted me to get a new set of bulbs but the issue continued so im convinced its a ballast issue