In addition to the LED tail/brake lights in the round tail light assemblies, there are also amber bulbs that work along with the extra turn signals along the sides.
These amber bulbs are mounted inside the clear plastic lenses, below the LED tail lights. So those round lenses will glow bright red from the LEDs, but also flash some amber when the turn signals are on.
The amber bulbs throughout the undertail are conventional, not LED, and are all the same type. I'm not sure what the part numbers are for those, but they are a common bulbs you can probably get at an auto parts store. (Which isn't to imply the undertail comes without bulbs -- it comes with all four amber bulbs and the two LEDs.)