I had built some boxes from 1/4 plywood for my 68 EC that mounted below the rear shelf. With a few modifications I made them fit behind the rear flap centered over the hump. Mounted with a few L brackets and the lip that sticks down about 1 inch. They are 6x9 and sound great but not a big stereo surround sound type of affect. They are in the middle so not really in the way as far as getting stuff in and out of the storage area. No pictures at this time.
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