Since I was on here last I have aquired another Blue 750. This has the novelty of "twin carbs"!

As with my other Paso it has suffered the ravages of time and British weather and sports a patch on the left hand silencer (very neatly done by the way) so I am looking to fit a single can, kindly donated by my bro.
What I need to know is, does anyone make a 2 into 1 converter to fit? or wil I have to fabricate my own from scratch?
Any help or suggestions would be greatly appreciated.
Cheers.
Steve