If you had the three-button remote fob, you can pick one up on e-bay. That's what I did, and it works just fine. Programming these remotes requires you to access the alarm brain which is behind the glove box. You take a chip out of the remote and stick it into a special spot in the brain...push a button, and you're done. Process takes about 2 seconds, taking out the glove box takes about 15 minutes.
BTW, got the remote on e-bay for about $40.
<span style='color:green'>1994 325i </span>- - - 75,000 mi.
No mods - - - very happy as is!
<span style='color:green'>1995 525i </span>- - - 154,000 mi.
No squeaks or rattles... unreal!