Lifter Question

Hurricane87

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Sep 2, 2019
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Brevard County, FL
I have an LS4, and the inevitable lifter failure has started. I want to replace all of them, but I can only find one GM part number, and I'm sure there are two. Even RockAuto only lists one part. Can someone give me both part numbers, or am I hallucinating and there is only one lifter for both intake and exhaust?

Also, some places show plastic trays for the lifters. What do those do?
 
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