Hi D-nifty. Most of these single DIN head units are held into their mounting cages by a sort of spring loaded arm that is nothing more than a metal tab either side of the head unit. Head unit manufacturers supply these 2 long metal 'keys' that you slide in between either side of the head unit and the mounting cage to force these arms out of the way, but even then it can be a PITA to remove the head unit as there's nothing to grab hold of to slide the head unit free. If you're going to get it out don't use anything too thick as a substitute for these removal keys at it will only jam the head unit in there. It isn't that bigger deal to pull the dash bezel out and try to free the head unit (might only need to pull the bezel forward enough to see what is going on and push the head unit through, but... installing an aftermarket head unit in a MM/D-50 usually means butchering the metal framework inside the dash so only the guy upstairs and whoever installed it knows what you're going to find. It might only be anchored to the front bezel or it could've been hammered in there. Good luck!
Pop the heater nobs off, undo the fan switch, remove the 2 screws facing up from the ashtray, undo the 2 screws above the gauges and pull the bezel with the head unit still in. After that you can unbend the lock tabs on the cage and pull the whole thing out. Some decks have a plug on the back that can be removed so you don't have to fight with the wiring.
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