Mil-g-23827 mil spec single material response or 215-00613,a-7a,fscm 800378 mfr ref single material response or 215-00613,a-7b fscm 80378 mfr ref single material response or 216-00613,a-7d fscm 80378 mfr ref single material response or 218-00613,a-7e,fscm 80378 mfr ref single material response