if you have a 91-92 kit and the tanks haven't been changed they are definitely the old style tanks and not alcohol resistant . mine is a 92 kit and had the old tanks , they were the small tanks but gray like they had been painted . like was mentioned , no serial number . I think there were some pictures of both the old and new tanks in one of my albums . if there is a serial number , it will be scribed on the inboard end of the tank .