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help please

im getting the er rocker arms from zzperformance and was told i would need new springs so im gonna get the springs from gmpartsdirect.com part number( 12589774) but idk what retainers id need any help would be greatly appreciated
 


if your going with zzp for the rockers why would you go somewhere else for springs and retainers. not to say that their parts are better or worse but they have tested their products with their products and had success....why would you go against that? would saving a couple bucks be worth the risk of getting it wrong?
 
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