Mine's very similar to Angus, long bolts through chassis tubes, with bits of tube as spacers. Ends of the spacers are shaped to fit the chassis and I've got a shorter spacer at the front so that the front of the handle is close to the tunnel when off (just enough room under it to get your fingers in). It's also as far forward as I could get it without it getting in the way of the gear lever, so I don't need a double jointed elbow to operate it.
Hope this makes sense !! Steve