BMR 68-72 A-Body Driveshaft Safety Loop - Black HammertoneProtect your 1964 1972 GM A Body, while complying with NHRA safety rules with a Driveshaft Safety Loop from BMR's suspension. If you drag race your Fourth Gen, chances are you need a driveshaft safety loop to be NHRA legal. Built from 1 4 inch laser cut CNC formed plate steel, BMRs DSL007 Driveshaft Safety Loop welds on to the factory floor support located behind the transmission. This design gives you a solidly mounted loop that will stay in place