commonly the amps are somewhere in the back seat, either under it or behind it. Depending on the year it the car was made. I know my 82 doesnt have an amp the speakers run off the deck. So if your car is older it might not have one. I think MB started to improve sound system round 85 or so. Check in the rear seat, behind it or underneath.
It will be behind the rear seat. Undo the two bolts holding the bottom half in, then you have 3 8mm's to deal w/ holding the top/back half in. Watch out for the fabric that attaches the leather to the frame, with age it becomes quite brittle.
Once those 8mm's are out you need to lift up, then out.
Let me know if you need an amp, I have a few good one's here.
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