This unit was removed from a 1980 Cadillac Eldorado that had been totaled by a rear end collision a few years ago. I purchased the car for the mint interior for one of my other Eldorados. It has 82,000 original miles on it with the 368 cu. in. Motor.
Thhe car was immaculate. Prior to the accident this car had been garaged most of it's life. This part has been stored in heated storage since I removed it from the car. The switches show no corrosion.
It would fit the Seville for that year and probably some other years and GM Models. Make sure this is the correct part for your car.