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The triumph should be 3 phase, as it is quite modern. But no idea in practice.
Would add make sure the joints at the stator are good and low resistance, go through and check all connectors from the alternator, to the reg/rec and to the battery are minimal resistance. That can cause issue once everything is working right that there is heat generation elsewhere and other issues may arise.
lynx
You've got to pick one that's appropriate for the alternator output (like Lynx says) and make sure you've got the correct input wiring as they're usually potted. If you've got a 3 phase stator (3 wires coming from the engine, usually yellow) you'll need a 3 phase reg/rec. You can use a three phase reg/ rec on single phase stators, just tape up the extra wire. You can do VV, but you'll have less output.