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I do believe they spec those things by amps rather than engine size. (So you would want a minimum 60 amps and preferablely 65 or 70.) So if you order a 460 it should fit (assuming you've got a rear-terminal, and you're replacing with a rear-terminal). You MAY want to get a new voltage regulator to match, just as insurance.
You'd want the dual battery if you were running the winch/lights with the engine off.
ash
['The regulators are the same, but a cheapie may fry.']
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