The lash adjuster is not that much. I think there like 14 bucks each or something like that. Rock Auto has them. If I was you I would just get new ones. If you pull the vale cover you can run the engine with out it and find the noisy one by putting your finger on the rocker and pushing down on them one at a time. Yes it's a mess. Or pull the valve cover bolts. Run the engine shut it off and then feel for the loose one.