This just adds an image in the empty slot on the mod selection screen (if you're using the rFactor HD UI). Not a huge deal, but it's something that has always bugged me, so here's a fix.
Just drop the .tga files into your rFm folder. Doesn't overwrite anything and won't cause online mis-match.
Just delete "reiza01_Logo.tga" to "reiza18_Logo.tga"