A reversing light is required for category O2 (trailers with a maximum mass of more of 0.75-3.5 tons). You will need 2 if the total length of your trailer is greater than 6000mm. For category O2 (trailers with a maximum mass of up to 0.75 tons) these are optional. Protempo has the Radex reverse light type 4002 in stock.
Back light Radex 4002
name reversing lamp brand Radex type 4002