You can get three different widths of Touratech aluminum hard cases. I found that out when the lid came off of mine and was run over by a car. When looking for new ones I found that they had widths of 10.5", 9", and something narrower. Mine are 9" and I wouldn't want any wider than that.
__Scott R. Nelson, 2008 KTM 990 Adventure, 2001 Honda XR650L, Folsom, CA