I was at the dealer today and wanted to pick up the same speakers you need.
They had ordered the wrong ones. The parts guy looked them up again and all he could find was the entire door assembly, over $250!!!
I'm going through Bose's support to see if I can get them that way.

I'll reply with their cost and part number when I get them.

If I can't get replacements, I'm seriously thinking of dumping the entire Bose amp and speaker setup.

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Current Crop:
2002 ML500
1997 SL600
1969 Corvette (for sale, perfect shape)
1984 RX7 GSLSE

Wanted:
a diesel MB!
Looking for a new SL.