I fitted an Optima yellow top in the ARB tray by turning the supplied heat shield upside down and back to front. I secured it by using two M10 threaded rods with a piece of aluminiun angle under the heatshield drilled for the rods to go through. The Optima has the cranking amps to start my TD5, as I found out the other day when my starting battery died, but you need heavy duty jumper leads, mine weren't so had had to actually put the Optima in start battery position.
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