| I've seen two types fitted to Dukes. The first is a bracket that clamps around one of the frame tubes and lies on another for supprt. IMO these would destroy the frame.
The second type are those that mount to the forward engine mounting points, using a longer engine mounting bolt. These are a far better bet as the force would be directly onto the frame and engine and therefore less likely to bend the frame.
If it was a big enough off to damage the frame/engine with these fitted then I think that'd be the least of your problems.
Guido has these fitted and I know he's tested them out with some success. Drop him a U2U...........
You will have to cut your panels which ever ones you fit though. | 
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