I have recently gotten a steal on a 97 Z28, although the car has some minor flaws it is in great shape. I have ran into one minor problem though, a friend and I were fixing an oil leak and discovered that the timing cover was damaged. I have been trying to find a replacement for the car but to no avail. Every cover I find has a small diameter hole for the optispark, but this car has a large diameter hole. any suggestions on where to find this replacement would be great.