Are you adding a tail light on your 2020-21 Gas Gas EX or MC?
This is the kit you are looking for.
Includes a rear fender (EC) with bosses to attach a plate holder and tail light.
Rear Fender - OEM
License Plate Holder - OEM
Tail Light with bracket - OEM
All OEM hardware - OEM
Rear Brake Pressure switch - Enduro Engineering
Flex Plate - MotoMinded