Choose tek-lok for duty belts and molle-loks for molle vests Choose D-Rings for FIREMAN straps Bungee style shock cord retention lanyard provides an additional level of retention to complement the built-in custom fit design OUR CASES ARE DESIGNED TO FIT AS MANY DIFFERENT BATTERIES AND CONFIGURATIONS AS POSSIBLE. THERE WILL BE DIFFERENCES IN FIT BETWEEN BATTERIES/CONFIGURATIONS - THE RETENTION LANYARD IS DESIGNED TO ACCOUNT FOR THOSE DIFFERENCES.