I found this cap on the net which might be a good alternative to the CB600 unit
comes with a 0.9 pressure relief (saves finding another cap)
http://www.frozenboost.com/product_info ... ts_id=1064

any thoughts from those who have done the conversion???
I'm just about to convert and am having trouble finding the Honda unit.

Are you having trouble finding the filler neck or the 0.9bar/13psi cap?

If you are contemplating using that whole assembly .... I'm not confident it would fit.

well, I bought one and fitted it...

it lives above the plastic filler tank and can be accessed / opened / filled by removal of the front fairing around the headlight...

some minor plumbing required...but at least the hoses are available...the Ducati OEM hose will be difficult to replace.

I will post some pics later...