topgun...all of the identified crf250x and crf450x plastics have the provision in the rear fender for the led light. so, if the title says it's a rear fender for a crf250x it will have the led mount/opening.
on the rear light brake. you'll need the DRC CRFX LED and the hydraulic brake light switch to get this to work. both are in our catalog as well.
hope this helps...ken