5.2 LITER. Aux radiator bolt. AUXILIARY. A threaded rod with a drive head (such as hex, 12 point, torx, etc) on one end used to secure the Frame Rail End to it's mounting point. Fender Rail Bolt. Radiator Mount Bolt. Adapter. AUXILIARY radiator. Fender Rail. Frame Rail End. HEX - HEAD SCREW 6X30. Radiator Mount. Tail lamp ASSEMBLY.