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Depends if you want to do the simplest install, then make sure they fit under stock covers..
You can buy aftermarket rockers that are basically stock with the bearing/snapring upgrade- Melling
Or you can go with a full roller aftermarket performance rocker...
You'll have to decide on budget, intended use, and how "deep" you want to go
Not sure what your setup is, but if stock first question would be why do you want to change them? Have you considered swapping only the trunnions?
Also, if you do go aftermarket and they have a larger MOI (many aftermarket rockers do), than you need stiffer springs and you need to verify the wipe pattern followed by verification of the pushrod length.