I had to buy a new quaife input shaft for when when I started getting clutch clearance problems! It cost a good few hundred quid, looked as worn as the one you've got there, but to be honest, didn't fix my problem so therefore means it was still in ok working order really. Depending on how expensive your clutch is, it might be worth just fitting it an see how you get on. But if you've got a mega expensive clutch, it's probably not worth fitting as it would damage the centre splines on the clutch quicker until it strips them too.
Gtir Motorsport club