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Loose valve shims in ex. keepers CRF250

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I just bought a used full works MDK head for a 2008 CRF250R with Pro Circuit Ti spring kit. For some reason the shims are loose in the recess in the exhaust keepers. The bore(keeper) measures to be 7.62mm i.d. The stock shims are 7.48mm o.d. It is about .008" difference. The intake shims fit as they should. Does anyone know of special sized shims for these keepers/ or are they just worn out?

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I think you need to replace the keepers. .008" is really not a whole lot, but why take the chance of 1 bailing.

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