If you have a 2017 Microlite it will fit the hole perfectly but will need refitting as the new unit has different plugs on the back. It was easy for me to rewire as both new and old have schematics so I cut and spliced easily. The only real difference was a new block of 2 power supplies like a car radio, one 12v constant, the other 12v switched. I only assembled them as the camper doesn't have an ignition switch.
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