Here's mine:
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That's a cobra 29 WXNWBT and the same size as any other 29.
It's a tight fit.
I'm currently swapping for a cobra 29 LX BT:
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I need a different angle for better viewing of the LCD screen on the LX and the only way to get it is to move it closer and angle it up:
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The other option would be one of the trans "hump" brackets:
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Not as pretty, but it works. I wouldn't look to buy one of those. They're easily made with some 1/8 flat stock, a vice and a drill.
There's really no easy way to get a full sized 29 under the dash power plugs. The heater box takes up that space. You'd have to do something radical like cutting off the floor vents and then you'd have no floor heat. You might run into problems with the internal components of the heater box also.
There's just no room to be had under there....