Need help - Which pilot bearing ?

[blykins]

You spec the bearing/bushing for the clutch.

If you're running a really aggressive disc, such as a sintered iron or similar, the dust will actually wear a bronze bushing over time and you'll get slop there.

For really aggressive clutches, it's best to use a bearing.

For factory style discs, like an organic disc, you can use a bushing.

Make sure you dial the bell in, or you can get a worn bushing/bearing as a result.