I've seen a few threads that have mentioned those, but I fall of the train with two main things:
1.) Like front-end swaps, I wouldn't know where to start on what models would be compatable, and every thread I see is for a 550 or a 750 - never a 650
2.) I haven't seen any really good pictures of these frame clamps and can't visualize how they connect, or where on the frame they mount.