This one looks to be cut right where that rear bracket started. That would have to be 100mm or so yeah? (I'm not near my bike to check...)
That bike may not be using the rear mount at all. Thanks for posting, I'd be interested in something like that if it did use both mounts.
You could always make up a new rear mount/bracket if needed. Likely you can get a couple inches off without a problem, doubt its that close. My Beta/FMF was an easy three inches. Why have that big lever hanging out there to bend your subframe? Even a minor tipover with the can hitting a rock will do it, seen it happen several times.