Ok, I'm sure as long as the kit is still in a resellable condition the vendor will swap em out....I've had to do that before on colored lights (not HIDs) when they sent the wrong one or it didn't look like the ad.
Let me know if you want some 6000ks, I have an extra set now of the bigger ballast style from the last GB, I am gonna try to put the slim ballasts on tomorrow but may keep the old bulbs in the housing and just swap plugs.