@Drafi5 - Yep, the Jaguar visor is a blank one - this is what's supplied in Ric Lampert's Suzuka track. As the GP4 visors are made by Viper (he gave me permission to use his textures long ago on the GP4 forum),I made the set based on this. If you know how to use GP4 editing tools you can extract the .tex files from the track .wad files,convert them to .tga and resize to 1024x256. Then just edit the visor.ini file to suit. My personal set uses the green visor strip from another author whose permission I don't have(MRT - didn't ask him by the way), that's why I haven't posted this.
@Racefan - click the banner at the top of this page to be taken to GrandPrixGames.org - you'll find them there. Please read the readme after downloading as there may be some issues with graphics cards, resolutions etc.