You could order it from your local dealer or maybe another member has one. I've seen a bunch of members who have replaced their stock exhaust with aftermarket high mounts where that spacer is no longer needed. Try posting up in the parts wanted section and I'm sure someone will be willing to help you out.
Another option is to find someone on ebay who is parting an older Monster out and ask them if they have the part. I know an ebay member named Desmoporsche does alot of that. He may not be listing one now but he may have one left over from a bike he parted in the past.
Good luck!
