Through bolted it attached to a piece of flat stock metal. You can make your own (pretty easy) or buy a "Engine Adapter" from one of the parts sites. Search for frame saver on Ebay if you dont want to drill a hole in the frame.
You know , it's amazing how some colours and tones I would never even think to use on anything much less abike look totally awsome. very nice.
Is that a dyno glide frame?