If you have the stock plastic lenses, sounds like you have, they are sealed. Sorry. Going to have to upgrade to Euro glass lenses to add angel eyes, I'm afraid. Whole new headlights.
1995 325I, window tint, K&N, debaffled airbox, BMW #104 wheels, Nighthawk low beams, smoked side markers, smoked corners, smoked taillights, M3 stlye heated mirrors, various interior bits, Bosal cat-back.