Well, if Ross or someone else doesn't have a few of them sitting around, call up these guys http://www.bavariansoundwerks.com/. I know they've got a drop in speaker upgrade for E34's. I know they've got a whole 10 speaker package for the entire car. I think you can also get just a pair from them rather than the whole package. But you'd have to give them a call as that's not an option listed on their site.
Cosmos Black/Black 1995 540iA M-Sport
BMW Individual Exclusive Edition, 1 of 65 total, 9/25/95 Build