Ok, some pics. The spacer is 32mm long, aluminium. And the hanger bracket is 45mm between bolt holes and 6mm thick aluminium.
You could have the hanger straight down. I made a longer one and angled it towards the rear. This way the exhaust strap/bracket is more towards the centre of the can. Probably no real need if you go for shorter cans.
Make sure you ask for offset exhaust strap/brackets to be supplied with the cans.