YIRYDE
formerly pman2011
Plug the Tricled harness into the bike harness per instructions. Most likely the black wire will be ground. Turn on the hazard flashers and test each of the other leads with a test light or voltmeter and see which one gives the flashing signal. Plug the new light into the selected wires and see it flash!
I agree that this will work, The 5 wire connector for the rear lights on the Spyder contain the following 4 signals; Ground, Run, Turn and Brake. The Black wire is ground, it's just a matter of finding the turn signal by using a voltmeter as IdahoMtnSpyder mentioned. I would also document and save which signal is on the wires for future reference in case you want to add some more LED's to the rear of your Spyder.
Here is a kit from Spyderpops that offer Run/Turn which is a popular wiring configuration for the Saddlebag Led, https://spyderpops.com/rt-2020/led-lights/saddle-bag-run-turn-led-lights/
Here is a LED package deal, https://spyderpops.com/2020-up-can-am-spyder-rt-2020-vision-led-light-package-includes-fender-amber-run-turn-mirror-amber-run-turn-stay-ons-red-saddle-bag-run-turn-leds-spy402/