I crawled into the trunk and looked around at the rear deck. It seems there are two 6 1/2 inch speaker cutouts in the metal deck on each side. It looks like it was prefabricated for the bose system. I only have one speaker on each side, mounted in the outboard holes. They are 6 1/2" speakers. the upper deck is blocking about 25% of the speaker output. I am curious as to what the bose system looks like back there. it looks like I could mount 4 speakers back there but the upper deck would block about 40% of the inboard speaker output. The speakers in there read part # 210 820 11 03 or 02. It says High quality loud speaker made in germany. from below I saw a big diode or something and a spool of thin copper wire hooked up to it. Any of you 97 W210 bose system guys familiar with your rear speaker setup. Thanks Jim

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1997 E300D Wife's daily driver
1985 300SD my daily driver
1999 Expedition family road trip and material hauler