The bekker kit wil be perfect bolt on and no other modification required for any car (US Spec) 1997 and up
For the earlier year 1995-1996 with pre-updated headlight
you will need:
1. Modify you under headlight panel (you might need to dremmel the back of it (if you're a pretty handy DIY'er). or get 1997-up panel. In any case this dremmel part should be pretty straight forward.
2. You will need to change the headlight fuses from 7.5 A to 15 A (as the Xenon unit requires higher fuse rating that halogen)
3. You will need to get a wiring socket that will be plugin to your headlight harness to fit these Xenon headlight (I don't remember the part number for this socket, but you should ask bekker. They know about this.)
This socket is not a specific requirement for Xenon headlight, it also a requirement if you have 1995-1996 cars and want to put newer headlight on you car (1997-1999 headlight).
Hope this helps.
Regardz,