I like Speigler but have used Galfer in the past. Speigler allow you to turn the banjos so everything fits nicely.
I've searched a bit and found some alternatives, although I can't really figure out the model codes for this bike

I know there's a CB650C variant that is a bit different, would cables for that fit my standard? Then Spiegler lists cables for CB650 K from 80, and HEL has cables for a CB650 Z from 82 and onwards...
Are these letters just per market, or do they mean something else?
I used HEL braided lines on my 750, which is a 2 piece line. Fitted perfect and came with the replacement hardware to fit them. I went for their black outer, so it looks stock. I used their lines on my 2 disk Bandit, too. Happy customer.
A bit curious on the 3 to 2 line conversion, do both lines go to the master cylinder then?
If you are reasonably mechanically minded they are simple to assemble yourself, fittins and pipe available on ebay, depends a lot on your countries import duties etc
I'm quite new in the garage, so I think I'll leave it up to the pros for now

Would hate to bust a brake line when I need the stopping power...
Found a kit from probrake.de which matches my model exactly, has anyone got any experience with them?