Might want to consider upgrading to an aftermarket LED bulb type - especially if you want to match the color of the xenons. Just make sure they come with a ballast and state that they won't give off any error messages.
2004 BMW 530i (his) -Titanium Silver -Grey Dakota -Dark Poplar -Premium -Sport -Cold Weather -Xenons -Heated Rear Seats -Active Steering -Logic 7 -Sirius
2015 BMW 435i GC MSport (his-planned) -Estoril Blue -Black Dakota -Aluminum Hex -Premium -Cold Weather -Technology -Lighting -HK Sound
2010 Lexus RX350 AWD (hers) -Smokey Granite Mica -Black -Premium -Comfort -Nav -Tow Prep -Premium Sound -Wood Steering Wheel/Shifter