V8 Archie sells a fiberglass front battery box as well. Same idea as the one from WCF, but has a "shelf" which fits over and behind the stabilizer bar.
Mine arrived sans instructions; not sure if that's normal or not.
Rather than do the smart thing which would have been to phone or e-mail for exact location info, I tried to find the optimum location myself.
Problem is that I was off by a small amount, and the spare tire binds up between the rear-top edge of a proper-sized battery and the a/c accumulator when I try to drop it in.
So for the moment I have a 425CCA lawn tractor battery in there.