maybe need some clarification here ... are you wanting to get HID bulbs as in keep the same head lamp unit and have some nicer clearer looking lights or you want the projectors like Scott has ?
if you are only wanting to upgrade the regular bulbs to HID then you need to purchase a HID Kit we have 2 vendors here ...
Tony of Xentec (tcm glx)
and Steve from XenonDepot
but if you looking for project head lamp unit those are kinda pricey and are PITA to find around ... Scott will chime in that soon here