This is the Team Integy Silver Aluminum Rear Body and Pin Mount for the Traxxas Revo 2.5 and 3.3.  This is much stronger and stiffer than the stock piece, so there will be less flex.  This is great for serious drivers.  You must use this with the INTT3140S rear mount support.

INCLUDES: Four body mount components, two composite body posts, four steel body pins and mounting hardware