I am abit rusty with the Boxcar rear brakes, the last time I did rear brakes was on a EB SII (I am guessing not much was changed from EA to NC)

Now are the rear pistons the screw type setup?

Last time I had to back off the handbrake take pads out and what not and rotate pistons back into place and then reinstall new pads .... (is the handbrake self adjusting?)

Maybe you will get your answer here http://autofix.com.au/blog/how-to-change-ea-to-ed-falcon-rear-brake-pads Hope it helps

yeah all good did it today, bought a bad brake pad tool from supercheap for 17 and did it moments ago pretty harmless actually

Good you got it sorted. Cheers.