I did what medic is going to do. I got a threaded rod and ran it through and cut it to the length I needed. You will need to get a nut, washer and lockwasher for each end. I did not actually measure mine before I cut it so it is a little long but will do the job this summer and sometime during the winter I will cut it down to where it needs to be. I thing, before you cut it, put the nuts on it so you can use them to repair the thread from the cutting process.
The rod I used is actually slightly smaller in diameter than stock but these engines are bolted in quite well. It was like maybe .5mm small so no biggie.