This Mod works ok in GTL. Unfortunately, the cars have not been given a class, so you cannot use them in a race. Of course, you can manually assign a class and even create a clean install just for these nice classic f1 cars with great sound. But don't do it. GTL is not a good game for a mod like this. If the rear end begins to slide, you will crash. Instead, go and get Automobilista 1. It is very cheap on steam. And get this same Mod for that game. Automobilista is much better for a bit of sliding 60's F1, and the Mod is much more enjoyable, Even maybe one of the best mods I have tried on any game.