both sides seem to have felt; on the rubber seal that goes into the rail, one side is smooth, the other rippled; which one face up. Also, how to you determine front & back? Thanks.

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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)