As in topic how hard is it going to be to change my headlights to the later one piece style on my '96 A4 Avant. Please I need links on step by step guide on the conversion. Also, how do I know if I have remote cenral locking? The only key I got with the car 9 months ago has only a big button in the middle and its got one battery and an led but no light shows on it when I press the button. The car has SE trim with climate control, immobilizer, factory alarm, e/w , e/m. Thanks in advance.