These faucet caps are similar to the “DANCO” brand caps found at Home Depot (but will likely be more durable):
https://www.homedepot.com/p/DANCO-Hot-Cold-Index-Buttons-for-Glacier-Bay-Faucet-Handles-89958
There is a hot and a cold option. In my case, both faucets turned clockwise to turn on. If caps are needed with the arrow in the opposite direction, please let me know.
The author marked this model as their own original creation.