There are two factory "knockouts" in the rear package shelf. You might even be able to get the factory speakers!

Pull the rear shelf trim and peel off the rubberised sould deadening material in the two spots one would expect speakers to sit, and there they are. Not huge (6x9 sized, hole just large enough for the magent, speakers sit in a 1" high or so box). I think there is also a knockout in the shelf panel in each side, should help locate the others.

If you feel you need to cut into the rear shelf instead, be aware that the ventilation ducts are under there and you don't want to cut out the bottom of them -- sucks cold or hot air out of the trunk into the car. The air goes our of the passenger compartment through the slots at the base of the rear window and out the car at the slots behind the rear doors. You will have to duplicate the factory setup with a box, there is no way to flush mount the speakers without cutting away the bottom fo the ventilation duct.

Most aftermarket guys just rip through both sides and make a huge mess. We had to cut sheetmetal and weld up the bottom panels on my brother's '75, what a mess.

As far as the front kick panels go, these are glued in, very difficult to remove, and you risk snagging the vacuum lines for the door locks if you cut blind. Door mount is a problem, too -- you will have to sacrifice the map pockets and use a surface mount speaker -- no room inside.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!