Longest bar to the front as it leans forward , short bar almost straight up in front of the roll bar.
Bar brackets need to be fitted so that the bars can fold back to be stowed , thats if you want them to, mine dont as i boobed when i did my brackets due to not fitting them outboard enough plus my roll bar is padded thus making it even harder to get round, so i just leave the front one at home, the rear bar is then strapped to the roll bar to stow it.
A possible good mod would be to use an early Sprite or MG roof bars as they are spring loaded to adjust the hood tension and only need one socket to fit into, plus they split in the centre for stowing.
Mike