Here's 3 from Tower Hobbies
http://www3.towerhobbies.com/cgi-bin...?&I=LXB857&P=0
http://www3.towerhobbies.com/cgi-bin...?&I=LXB864&P=0
http://www3.towerhobbies.com/cgi-bin...?&I=LXZ667&P=0
I would suggest mounting at least an 1/8in plate on the inside of the fuse so the screw has something to bite into. I epoxy a 1 x 1 in plate an the side of the fuse then cut a square hole in the balsa fuse side with the same thickness of ply so the mount doesn't squish in the fuse side.