3 1/2 for the dash.
What sizes fit in the front doors and rear deck of 126's? 1990 sdl

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82 300D....went to MB heaven
90 350 SDL....excercising con rods

try www.crutchfield.com you may find specific sizes and compatibility there, in one spot you can enter year and model to find sizes

4 x 6's in the rear deck of my 1984 300SD. Just updated them.

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1993 300TE
1984 300D
1984 300SD
1976 BMW R90S

Front door would be 6 1/2" aswell as the rear deck if your car is 1990.

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99 C43
98 S420
99 C230K
01 C240

Thanks.
Crutchfield only lists the dash 3 1/2 w/ adaptors and has none fitting the doors or rear deck.

Will any 6 1/2 fit or do I need to cut/adapt and watch for depth clearance?

__________________
82 300D....went to MB heaven
90 350 SDL....excercising con rods