Your rig is pretty old, HDMI-wise. Concertone doesn't seem to have anything on their website. So I'm guessing you're not going to find a plug-and-play solution.
If it were me, I'd get the HDMI to video converter mentioned above, cut off the RCA plugs, then cut off the connector in your pic and solder your existing wires to the cut off RCA wires. Better yet, if you can get the converter box open, unsolder the entire RCA pigtail and solder your existing wires in their place.
THEN if you want a wall outlet, you would get a short piece of HDMI-to-HDMI cable to connect the wall plate to the converter box behind the wall.
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1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
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2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
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