Its been
proven in past LCI threads that the Xenon LED tails will work just fine on Halogen equipped cars. No extra adapter harness is necessary. IF you are getting LCI Blacklines order the #282 kit - that comes with both tails - it is cheaper than order each tail light separately.
Blackline LCI Taillight Group Buy *Feeler*
http://www.1addicts.com/forums/showthread.php?t=674384