I might have one... After cruise Moab I can find out for you... You are looking for the stock one? Take a look at what comes with a JDM 1981 BJ44 if you want to verify the part..
Thanks but I ended up making one out of 1/4" steel angle. I found some photos of the stock mount and it would get in the way of my intercooler plumbing. So a custom battery support was a better option.