I've been told that if you change your oil at intervals of 5000 miles or less, the old style filter should work just fine. They are widely available on ebay, or try fastlane here.

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87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)