ICT Billet 551181 Universal Billet Battery Tray Hold Down / Trunk Relocation Box Hold Down / Trunk Relocation Box 10.5" L x 6.95" W x 6.7" H Fits Most Car and Truck Batteries (Including Optima) Natural Aluminum Finish Batteries over 7.4" tall will require longer 3/8"-16 all threadTop battery hold down plate uses heavy duty 3/8" hardwareFits most car and truck batteries includingOptima Red Top - 34, 34R, 34/78Optima Yellow Top - D34, D34/78Optima Blue Top - 34M, D34M