My 803a had similar damage but not as severe. It was in mint condition except the rad filler tube had been twisted so the cap bound on the overflow tube. I was able to straighten it but I could never figure out how the heck it got damaged. There was absolutely no sheet metal damage.I have no idea what someone was trying to accomplish but this cap was still attached to the radiator looking like this. They did a number on the neck too. I straightened the neck as best I could and got a new cap but it leaks still as it can’t seal well.