Optima Battery Mount Group 31 Artec IndustriesOur group 31 Optima Battery mount will deliver. Offering more standard features than any other mount on the market you won't find a higher quality mount For the price, we guarantee it! Don't mess around with a mount that doesn't come close to the quality, and durability of our 31 series Optima Battery mount! Available Inch many other configurations including flat back For those tight installs, it's no wonder we have never had an unsatisfied customer.