I don't know the official spec, either, but there's a foolproof way: nip down to your local scrapyard or accessory shop, halfords, etc. Measure a few batts, c which one will fit your tray, note it's dimensions, product code an amp hour rating, an buy accordingly. Diesels need a heavier duty battery, to cope with the higher compression, your B20 will start on almost anything produced today. If your car has extra stuff, driving lamps, fogs, etc, go for highest amp hour rating as will fit in tray. Good luck.
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