Take a look at Century Plastics 30-H battery box. The base dimensions are L14 1/8" x W7 5/8" x H10 5/8". This may the 1/4" you need. According to what I just looked up, a 30-H is slightly larger than a group 31 so the battery should fit the box.
I have their GC2-E box for my pair of Trojans and they fit like a glove. One note: you will have to find a strap to hold the lid down.
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TM 2008 3023
TV 2009 Porsche Cayenne 3.6L V6
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