stick a ruler in and measure how far back it can go then check out the dimensions of a prospective unit at crutchfield.com or the manufacturers site.

ned, i sent you an email about subs for my 126.
thanks.

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89 300E Pearl Grey Metallic
7 Spoke 16" staggered wheels (SLK)
215/55/16 Hankook Ventus HRII H405 tires
Euro Headlights
Smoked Corners
Smoked red/clear tail lights

1987 300e Black Metallic (mom's car)
8 hole 15" wheels (C Class)
Clear Corners
Red/Smoked tail lights