I have no clue as to the answer to your question, but as a fellow 325i owner (1991), I just wanted to say, hey, awesome car! :-) I've had mine for 10 years, it has 250K miles, and I love the thing to death.
I buy all my parts on eBay and then give them to my mechanic to install, since I am not as brave as you and therefore don't attempt the work myself. You might try your question on bimmerforums.com...it's sort of the iFixit of BMWs, and it's always been a great resource for me.
Good luck!