John, the direct fit $10 are 43mm, but you can also get the ring type for the $10 and they can be used for the $10 with the ring or take the ring out and they can be used for the $20/$40 strikes which I believe are 47mm. It all depends if you want to get the direct fit or the ring type which can be used for $10, $20 or $40 strikes.
Jerry
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