I've got feelers out to Ryan at MCE on this. Let me check on the status of that. I'll get back to you.
From what Ryan told me, most of the police bike vendors are going to Corbin for the narrow cases.. Other than that, zilch.
However, Ryan clarified that Hunting Beach Honda (ugh) is making police bikes and that they get their modified cases from Corbin. You may be able to make some sort of arrangement with them (Hunting Beach) to get your cases modified or make the deal yourselves with Corbin directly. It might be cheaper to deal with Corbin directly, though.