Your local BMW dealer should still have these or at least be able to order them cause they're still available in NA. This site <eap4parts.com> is the cheapest place in NA for OEM parts and has them for around 150 U$ if you're willing to ship over seas. M http://im1.shutterfly.com/procserv/47b5da20b3...

I have blaupunkt odx542 in the rear of my cabrio and they sound awesome. In case you are not aware 99% of 5.25" speakers don't fit back there cause the magnet hit the inner fender. The odx542's are you best option *IMO*. I also have Infinity Kappa components up front which are also a excellent speak...