Just got an email back from David Silver's. His 71' Honda CB 750 K1 Handlebars Part # 53100-300-610P measure : 720mm ( 28.34" ) width
60mm ( 2.36" ) rise
60mm ( 2.36" ) pullback
Definitely appears to be a lot lower than the 71' you picture on your K1 ? So who knows ?
I think if a person is looking for "drilled" bars, then Part # 53100-300-610P ( 71' CB 750 K1 David Silvers )
Part # 53100-390-000 ( 75-76' CB 550 F 4into1 )
Part # 53100-341-000 ( 72' CB 750 K2 Vintage CB750 )
Part # 53100-377-000 or EMGO 23-93142 ( 75-76' CB 400 F 4into1 )
Anyway, that's what I came with. Drilled bars are definitely more expensive than non, but what ever a person is looking for