The GRC billet hold-down is the best way to secure an Optima battery in a factory Mustang battery tray. It is CNC machined to exacting tolerances. It will not damage the battery case in any way, and uses the original bolt. Our hold-down is race approved and can be polished to give you that edge you need at the next car show.
The GRC Optima Battery Hold Down fits the 3478 style Red, Blue, and Yellow top Optima batteries. Make sure your battery looks like the one pictured below.