Timing Chains, Cam Locks, Cam Buttons ?

[PHOENIX]

Heres a bunch more questions I need answers for

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Timing Chain:
If I have to buy a timing chain do I want a roller type?

If so I will check gm dealer for original type or get one of these, what do you guys think about original and these?
Edelbrock Performer-Link
Cloyes Gear True Roller
Crane Cams Roller

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Cam Lock Plates:
All these do is prevent the cam bolts from coming loose?
Are these a good cheap investment ($5) or should I not worry about these at all?

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Camshaft Buttons:
I understand these are supposed to hold the camshaft into place and not allow it to move. So these install between the cam gear and timing cover?
The crane cam roller timing chain set above comes with a "thrust bearing", is this the same as a button?
This part confusing me a little because there are different types and sizes.
How do I know what I need, from what I am looking at it seems as if they change depending on the cam gear, and timing cover.

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As always any comments and help is appreciated here.

Thanks, Eddie