Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
Ebay US and you will find CB 350 twin parts there, if you have to buy a complete box just tell the seller to ship the selector drum and forks and bin the rest
I know the other two dont fit but they can be got nos it is just easier to ask the seller for all three and they frequently leave them on the drum which is the same as 500.Those two links are the same seller but carriage might be high as you can only get airmail now.
I have almost a complete NOS gearbox for the 500 including 2 NOS selectors but not sure which they are, one is certainly the centre one but the other could be left or right. I could look if your interested. If you have a parts book list part numbers instead of descriptions as it avoids confusion.
What can I say, I still have loads of parts in the loft
Trigger, having a bad day mate, still awaiting DVLA extrication of finger!