If this is for a competition, then one should be in the kit of parts, or you can ask around other teams.
For off-season events and demos, you can get away with any 12VDC orange, non-flashing hazard/indicator light (eg
https://www.superbrightleds.com/more...nnector/1085/). We've grabbed them from local auto stores and haven't had a problem.
The only potential issue you may have is the current draw being too high, but with LEDs that would be surprising. (BTW, haven't used the one in the link, but don't see why it wouldn't work)