|Back Alley Bobbers Honda Spirit 750|
They currently offer nine build conversions for everything from 250cc Honda Rebels to the Yamaha V-Star 1100.
My personal favorites are those based on the Honda Spirit 750s.
Check 'em out, especially if you've got a Metric Cruiser that you're lookin' to customize. They are in Salt Lake City, but will ship anywhere in the world, they say.