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David you will need the Sig P938 #6 front and #8 rear sight size. Here : budsgunshop.com/catalog/product_info.php/products_id/5057/Truglo+TG13SG2PC+TFX+Pro+Day%2FNight+Sights+Pistol+Tritium%2FFiber+Optic+Green+w%2FOr (Just click the compatibility Chart) Here : https://www.truglo.com/firearms-handgun/brite-site-tfx-pro-handgun-sights.asp?catid=E5FDB84FE8F74C239330C1841BDD3D5E