The carpet is attached to the black plastic as one piece on mine. Check for release fastener (black plasic screw on mine).

Here's a picture of the drain in post #8. http://www.peachparts.com/shopforum/showthread.php?t=160374&highlight=condensate+drains

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)