I respectfully submit that you can indeed install up to 61/2" drivers in the door of an early W124 produced without door speakers. I'm not saying it isn't tight, but it's do-able and I've done it.

I'd be more than happy to pass along digital photos...I installed Boston Acoustics RC61 component speakers in my 300TE

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Best regards, Michael
'92 500E
'88 300TE