Quick clutch throw out bearing question

[saxart]

Getting ready to install a SBC back into the frame of my truck (it has a SM465 bell-housing and transmission) and had a quick question. Is there supposed to be any kind of retainer or spring that goes on with the throw out bearing when I slide it onto the clutch fork, or does it just slide onto the fork and remain held in place by the trans shaft?

I don't want it to rattle around if it needs something to secure it.
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