You should be able to find a series RR for $70-$150.
Second hand even cheaper.
The wreckers/importers up at Slacks Creek should have used ones cheep cheep
A Triumph genuine loom link is about $50.
A tiny voltmeter is even cheaper at about $5 on Etray but check the Aussie East coast rally thread for the latest fun when voltmeters failed and folk thought Stators were dying.