+1
This is exactly what I did.
Also with this terminal in place it makes it easy to fit the winch power lead, Impossible with the factory terminal.
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Thanks for your help everyone. Makes a lot more sense now.
MTA make a battery terminal with one m8 stud and 2 M6 studs, it's MTA 1507701. It seems to work pretty well if you've got other stuff to connect. Just watch out Narva sells something similar but it's 3 M6 studs (and you can't find 6mm lugs for 50mm2 cable)