I checked "Bolt on" didn't see anything that would be a direct fit that wasn't 100 or more. except this vintage chopper thing that was available on ebay for a short time,had a circular mount for frame.. Yes, to me, this is a big bike. Thanks for the tips to getting it up there alone.My back is long gone.Can't lift like I used to. For years I used to pick up/ deliver furniture, safes,appliances, pool tables. No more.Back is toast. I think what I want is a factory replacement style 78 cb750F ss factory mount welded where it is supposed to be. Maybe someone had a junk 1978 CB750 SS (or identical) frame and can cut that area off for me, I could grind off the excess and weld it in place. I want it to look factory.One more hurdle in the quest for a nice ride.I do have a Harbor Freight welder and it would be fun to get it to look right and be right.