I fitted Valk Bars. I bought the "Classic" cables but was dissappointed that they are only 2 cm longer than the "normal" ones. Waste of money. The old ones woulda stretched OK, since I had to reroute anyway - I have the Rivco riser AND Valk bars.
The bar-ends require a tapped thread insert or a nut welded into the bar. I turned-down some aluminium bar to "interference fit" (Note to self, next time do it to to "clearance fit"). I drilled and tapped a thread to suit the bar-end bolt, then fitted the inserts.
(Because I hadn't made them thin enough, the first one jammed half-way in and I had a hell of a job backing it out. I then turned them down quite a bit more and loctited them in). There were some fiddly details with washers and spacers to make the bar-ends sit snug without the central (rubberised) plug pulling-in too depp, but it ended up real neat.
Good thing is that nothing shows when you've finished, so you can be ugly and clumsy and nobody knows. Just don't scar the OUTSIDE of the bars, or knock them out-of-round or the throttle will jam.
Oh, and the stock grips and mounts come off easy. The clutch side has to be rolled-off a bit, but will come. The throttle side is 2-Allen bolts and slides straight off.