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John, yes Sir they will fit perfectly as the Model 686 is based on S&W's K/L (medium) revolver frame with "Round Butt" Handle.
John, they will fit ... but I really suggest you check out Hogue's Rubber grips for your S&W. I've used both Pachmayr and Hogue, and I much prefer the Hogue as the consistency of the rubber material is just better to absorb the recoil, and gives one q better grip on the revolver. Check these two: https://www.budsgunshop.com/catalog/product_info.php/products_id/86401/hogue+rubber+monogrip+smith+%26+wesson+k%2fl+frame or https://www.budsgunshop.com/catalog/product_info.php/products_id/86400/hogue+rubber+monogrip+smith+%26+wesson+k%2fl+frame