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John, the Hogue Centennial Grip will fit and give you a whole hand grip on the Model M642 (https://www.hogueinc.com/handgun-grips/grips-for-smith-wesson/j-frame-revolvers/centennial) ----- https://www.budsgunshop.com/product_info.php/products_id/89653/hogue+tamer+grip+sw+j+rb%2fbodyguard

You sure can. Go to hogueinc.com. It was my pleasure to assist you.

Hogue makes grips that will give you the size you want www.hogueinc.com