I actually used a Mt-58 Interstate and it fit perfectly.
I have the original tie downs thats utilize 2 J hooks, 2 wingnuts and the crossbar.
But the crossbar goes across the top edge of the battery at the positive end. It did not go across the middle top of the battery. Also note that the 2 J hooks are at a 45 degree angle, leaning towards the positive side of the battery.
There was also a hold down at the bottom of the battery, negative pole side, near the front headlamp.