Now I'll try and find the elusive flyweight 7LB unit. I know my boy has one on his Bee project here at Area51 and that it was one of the last ones in stock at Mancini IIRC.
If at least, I'll get the part number from his order form.
By the way, I mounted mine using titanium bolt, nuts, washers and stud just like the stock set up for even more weight savings.