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Triumph uses a HOAT coolant type.  It can be any colour so don't use that to determine compatibility.  I have used Zerex G-05 in the gold bottle for years.  If the coolant brand has HOAT stamped somewhere on the bottle, I would use it.  Make sure you purchase the 50/50 premix and not the concentrate unless you know how to dilute.  If you do go with a brand with a different chemical makeup, make sure you flush your engine and rad of the old stuff.  Mixing incompatible brands can gunk up your cooling system.