Well, still not put the Microns on, BUT, I have managed to make the originals fit properly, thanks to using the Service Manual diagram.
The spacers were on the wrong sides, and the can brackets were outboard of the hangers and not BEHIND them.
I think the Microns might fit somewhat better if I try that way round....
The pictures I found of Micron ones showed them being outside of the hangers too. !
DOH!