This is an optional CRC Full Box Rear Top Plate, and is intended for use with the Gen-XL, Gen-X10, Gen-X10LE, and older Gen-X12's that have the brushless offset pod installed. This rear top plate closes in the rear pod, making for a stiffer, stronger pod. This does add some weight as you will have to replace the micro left bulkhead with another motor plate, but is especially helpful in modified where the extreme horsepower can create unwanted flex. This also makes the rear bottom plate more resistant to breakage during crashes.
NOTE: The micro left bulkhead (CLN3353) must be replaced with another motor plate (CLN3340).