The headlamps on my 98 S4 are getting on a bit; I'm having to polish the lenses regularly to get rid of the cloudyness on the plastic covers and at least one of the adjusters has seized.. Time to upgrade to the post-facelift methinks. I've looked before and there seem tobe a range of prices for what look like the same thing on fleabay - I am fussy and want an OEM fit - do v.good originals come up, are they expensive at the dealer, or is there a very good aftermarket version that anyone swears by? Oh, and mine are Bi-Xenons (not they arent, they are plain Xenon / HID jobbies!) too with the auto adjusters - Siena reckoned that I could retrofit my guts to a later lamp assembly - is my understanding correct? Thanks!