On my website I offer Z32, Z31, and S30/130 battery hold-downs in 1/4" polished, 3/8" chromed, and 1/2" raised Z chromed trim. Today I decided to make a couple and finish them in brushed with a lacquer clearcoat. The main purpose was to bring the cost down.
Each is made of 6061 aluminum clearcoated to prevent oxidation. The tie-down rods you see are Optima and Z32-specific, but I can make custom tie-down rods for your battery. The hold-downs themselves can accommodate any battery up to 6 7/8" wide.
Price:
$45 shipped for the 1/4" $65 shipped for the 3/8"
Here is an example of the 3/8" chromed installed...