Found a left side bag for the scrambler on Ebay and bought an aftermarket mounting rail. Unfortunately the bolt they shipped me for the rail was too long or something and froze before it was fully tight, then stripped as I tried backing it out. Had to cut it off and then have a friend weld a nut to it so we could twist it out. Finally got everything mounted up though and I think it looks pretty good.
I have the same pannier. Now added the Triumph rear rack. A small modification to fit with the bench seat. The modification takes 15 mins. Now have a small rack and pannier.