As for the Television mount (that is right I type out television so it would not be confused with TV-Tow Vehicle)
Sorry I got side tracked there; as for the TV mount - the one that came with our Roo DID NOT have a second component. The wall bracket had a plate that had various holes in for various mount hole configurations to match various television sets.
The instructions that came with it explained the various patterns and also explained that our particular wall mount bracket did not have some of the larger patterns for larger (heavier) TVs because the bracket was not designed for their weight. It also warned not to use conversion plates( I think that was the term) to try and support a heavier television.