Well, depends if you have a coupe or sedan. For the sedan, none have the LED 3rd brake lamp except the Si and the Hybrid. But, the Si has the premium stereo whereas all the others do not. You'd want to use the Hybrid rear hat shelf in that case...as for it being plug and play...i dunno. As for the coupes, I'm not sure it would be something to do if the LX doesn't have the premium stereo. You'd be missing the subwoofer, so it might not be plug and play...but, it might be and you'd just have an empty hole for where the sub would go. If its a coupe, find a friend with an EX coupe and try the swap. Its easy to get the hat shelf out (keep in mind the light is integrated into the hat shelf). The sedan is a lot more involved in taking it out.