512 BBi battery

Is there a battery made to fit the original battery hold down bracket out there somewhere? The dimensions have to be 6.0 to 6.5 inches wide, less than 12.5 inches long, and less than 7.5 inches high with a reverse positive post position.

I canot find a battery to meet these dimensions. The 7.5 inches high is limited by the battery hold down bracket threaded rods and the cover over the battery.

The previous owner rigged up a non standard battery hold down bracket and I want to go back to the original bracket.

Help would be apprecitated.