i think the size of the speakers depends on the audio package that was ordered when the car was new....my car has four 4x6 speakers in the front and back dash...but i believe some SDs came with 6.5s in the back, and 4 inch coaxials in the front....the best way to find out would be to measure the stock openings for the speakers....btw my 300SD is an 85 too
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1985 300SD 192,000miles...Astral silver/ Grey MbTex
1983 300D 194,000miles...White/Tan MbTex...my newest addiction
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