I have exhausted my search and have not found a needled bearing shift shaft support. Sato has a teflon coated bushing: Racetorx has theirs with a phosphorous bronze bushing. To help brace the spindle for more positive quickshifts, I would go with the metal bushing for longevity.
I'm not sure a needle roller bearing would be suitable as the area on the shaft they support is just a lathe turned surface, not a ground bearing finish, maybe why they use bushes. Don't have a support on mine but noticed the play was reduced after fitting a new gearchange shaft, after 22k miles the old one had some wear around the needle roller location in the LH case. Not suggesting a new shaft, mine was broken anyway, and a support is much easier to fit. If they use standard size bushes you could probably replace them yourself if the wear out.
Racetorx are the ones to get for our bikes. I know this because the one fitted in the second picture from their page is my bike and its been on the bike for well over 10 years, have recently changed the engine so had to take it off and fit a different one for the new engine but wouldn't use another brand other than racetorx myself.
Thanks Guys! Wow, that's your bike! Love to hear what else you have that I might need for track reinforcement. A good point about an unpolished surface not best suited for bearings. The 2013+ and 765 shift shaft might be smoother since it appears their part has needle bearings. I have read those engines are producing a bit more hp and torque.
Not sure, though after fitting a 765 engine the new shift support will be for that engine, no issues so far but I've barely put any miles on it yet. It's just as smooth as before, wouldn't own a bike without one now, more so for piece of mind that its there and for what it costs its hardly going to need a bank loan
