[SS454Elky]

Well, I have had the car since 1980, so any modification would have had to have been prior to that. I did have the dash out once in the late 80's to track down an electrical short, but did not think to note any numbers. It just wasn't a big deal back then. The car was built in the Kansas plant in the second week of Feb. I searched for a build sheet many years ago and did not find one. The only place I have not looked is on top of the gas tank. Maybe its time to pull that out. So I guess the consensus is that it would have been added prior to 1980?