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The MQ/MK differences are explained in another thread, but IF you like could you post up the pics you have ,future reference for newbies
The wiring as i mentioned youll use whatever is from the petrol car,into the new replacement body
Alternator will stay on the engine, and the wiring harness youll swap over will take car of that
You can either use the rectangle lights or the round whatever you fancy , the round light slots can be modded to take the rectangle lights,but the petrol will be 12 V, so whichever lights you go, youll have to go 12V lights
The wiring plugs are different as well at the light,indicators and a few other areas, but go the full wiring swap and that headache is gone
The power steer,
Get the pulley and engine to power steer pump bracket of a petrol engine (there different), on the petrol it bolts to the engine head where the triangle plate is (pic 4 from the bottom pic above)on the engine at the front ,front of head
The power steer, pump box, hoses, pitman arm ect are a unbolt rebolt conversion , other than the bracket and pulley i mention
Leave the steer set up complete ,till you source the brackets you need, if theres no leaky hoses, just fit it up and your done
Ill have a look for the power steer brackets here,but postage could be a killer for you
Hope that helps