Driver-specific cars not appearing in race

In historic mods like CanAm 66 and GPL, cars have drivers from the times assigned to them. However, lately when I race those mods, the panoply of AC drivers shows up instead of the historic drivers. I checked the skins folder for some of the cars, and the correct drivers are displayed. Is there a command to add or remove the generic drivers assigned to the race and only use the assigned drivers? I'm using CM and CSP.