You need to measure the pocket in the top of the retainer to get caps the right diameter that will locate correctly.
Then you need to know how much is missing from the base circle so you can get the right thickness.
^ And this is why I wasn't specific it's an exact science as Doug has pointed out ;) (sorry for my gumby explanation but I figured "stress relief" was about as techie as anyone would care about)
lash caps usually go under the stock buckets to take up the clearence left by smaller base circle cams so you get back into the stock shim adjustment range.
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