Optima Billet Aluminum Battery Tray Racing Race Trunk Relocation Box Hold Down Mount Red Yellow Blue Top 34 34/78 D34 D34/78 34M D34M Made in America 551183. This battery tray is designed to securely mount your Optima battery in your vehicle using sturdy base plates and hold-down clamps and includes heavy duty hardware Compatible with common Optima battery sizes: Red top: 34, 34/78 (DOES NOT FIT 34R) & Yellow top: D34, D34/78 & Blue top: 34M, D34M (may fit other Optima battery sizes) Made in the USA from aerospace grade billet aluminum Overall outside tray dimensions are 11.2″ x 7.9″ Battery Mount Kit Includes: 1 battery tray, 2 hold down tabs, 4 bolts.