RMSportmax-John Furbur, don't know if he is in business still.
I believe they sell the weld on ones.
There's a tab that welds to the frame in back a few inches lower than the bolt on braces I got from Holeshot (I think that's where they came from? It has been a while since I bought them, its possible I have the two vendors cross crossed as to which one makes which)
The ones I have have a c-clamp around the frame in the rear and definitely don't look like they would accommodate Vgas since those carbs tilt out so much. The brace crosses in the same plane as the front cam on the rear head.
The weld on ones have just that one weld, they bolt on from there and are easily removed for service if need be.
Not sure what UFO and Sean's braces do.