This is a servo relocation bracket and steering arm for the HG P407. This is a direct bolt in. Please refer to this link below prior to purchase to understand the installation and operation. This may work on the Re-release Tamiya Bruiser and Mountain rider but I do not have access to those models so I cannot confirm this. This will not work on the vintage Bruiser or Mountaineer. 

https://youtu.be/A5z4ZTPxzqg