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I know that eclipse makes boxes specific to standard cab trucks, plus their website used to have drawings that gave the length, width and height. You might be able to make one based on that info.
I used to have a couple 10s behind the seats in my 94 reg cab, they were made by Q-Logic. Real slim enclosures, had the top of the seat touching the rear cab window. Check them out.
You could also try the sub manufacturer's website and see what they recommend. Or call Crutchfield, they offer a sizing chart for boxes in their catalogs, they might be able to tell you what would work best.
i dont know the measurements or specs on the '94 model RC but i know MTX makes form fitting boxs that have factory fits, color matching, and mounting equipment.
Hey here's something i just drew up real quick, hope it helps. this a design for a sub box for a 12" sub in a reg cab pickup per the dimensions from some site i can't remember.
