Anyone know the thread size for a standard American automobile battery
(Sears Die Hard) that has side-posts?

I want to put mine on a trickle charger and the battery itself does not have
anything to connect the charger to once I disconnected the battery cables.

I tried several large sized bolts but they still are too small.
I'll have to purchase a couple at the hardware store once someone tells me
the correct size.

Thanks,
Walter