http://www.rfactorcentral.com/detail.cfm?ID=1955%20F1
This is the same team that produced the Porsche Fabcar Challenge mod.
Since so many of you have been waiting patiently for the release of this mod we decided to do something a bit different. We will be releasing each car as an add-on to the mod as we complete them. Since we have worked for over 2 years on the Mercedes W196 we thought it would be nice to let you enjoy what we have done so far. We will continue working on the other cars and when they are complete we will make the updates so you can build the mod as we progress with each car.......
We have included a lot of accurate features to the Mercedes like the actual drivers faces, accurate paint jobs depicting specific paint jobs from different tracks and correct car numbers. Driver and car info as well as accurate tire graphics.
We have also created some new features in rFactor, we have created a new leaning driver and a actual moving shifter to show you what gear you are in. If you can refrain from using the hud display, virtual mirrors or outside views your driving experience will be as close to what you would get in 1955.