ALL OTHER COMPONENTS ARE AS SHOWN. M12x1.75 (Common in older 4.9L Cadillac, newer GEN IV 6.2L LS9 and Volvo). M12x1.5 (Common in Honda/Acura V6 engines). I am a Tool and Die Maker/Machinist by trade and developed the NS300L™ insert system our of necessity and frustration.