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It's fairly easy to measure mount depth yourself
Speaking from experience with my car, an '82 300D-T, I think you can access the rear speaker boxes through the hole on the rear deck for the first aid kit. Remove the first aid kit, and you'll see a couple of screws on the bottom of the box. The box lifts right out after removal of these screws.
On my car at least, the rear speakers are enclosed by sheet metal in a "bowl" shape. You should also be able to make sure that 6X9's will fit there. You'll also see that the fuel tank sits beneath the rear deck- be careful when drilling.
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Marshall Welch
Seattle, WA
1982 300D-T
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