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MadXJ did an article on the hard to find diesel battery tray.
http://www.madxj.com/
Have you tried here?
http://www.4wheelparts.com/prodDetail.aspx?partNo=MGIMGBT02&jeep-parts=true
Heres one that I found, pricey and requires that you relocate the JTEC unit: http://www.wranglernw.com/ProductPickerResults.aspx?year=1997&make=16&model=65&engine=29&option=0&itemtype=11