well I know on mine nothing more than a 4" will fit the front. are you sure you can fit a 4x6 plate? The speaker cut out is 4" at it's widest point (towards the center of the dash) and then tapers off so I don't know how you're gonna fit a 4x6. I could be missing something though... With the rear speakers, I measured mine and from edge to edge they measured 6.25 (?) I don't know if this is some odd size or am I not measuring correctly? I'm gonna try to fit 6.5s. I'll borrow an old 6.5 from a friend and see if it fits before I buy the dang things. Another possibility for the front would be to have 6.5" kick panels made. The sound would be much much better BUT your e-brake would be in the way, and it would be more expensive. Just an idea.

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'86 420SE Euro
904 Midnight Blue, Gray Velour
Dad bought it new, now I own it.

"A Mercedes-Benz is like a fine wine, it only gets better with age."