So you want to put the original bulbs in the new xenon lights? Im sure that could be done, just a case of mounting the bulbs correctly, possibly changing the reflectors out for you old ones.
or if you mean your worried about actually wiring hids in, a hid kit comes with all the wiring needed to attatch to your existing lighting loom.
im relatively new to xenon stuff, ive been fixing my girlfriends light recently, so what im saying is based on limited experience.