Here you go:
List of parts for 12v conversion.
Alternator
Starter
Stop solenoid
Glow plugs
Glow plug relay
Wiper motor
Washer motor
Horn
Relays x 3
Wiper relay
Indicator unit / flasher relay
Fuel gauge
Temp gauge
Egr blanking kit and disconnect the egr ecu
All bulbs
Fuses need to be uprated to double amps (half the voltage double the amps is the rule!)
The headlight level motors can stay in, they just work slower.
Heater motor
About a days work to complete, the costs can be more than compensated for by the sale of good 24v components.