Pannier Supports

I have a 2013 Thunderbird 1600.
I've been given a set of Triumoh throwover panniers.
The bike also has sissy bar and rack fitted.
I'm looking for some supports to enable me to use the panniers and not have them interfere with the wheel.
The only ones I can seem to find are only suitable for use without the sissy bar.
Anybody else had this and how did you get round it?!??