It's been awhile since I have been able to update this. I eventually got both sills replaced. Have to say thanks to spice_weazle for the excellent quality replacement sills, it then got all the nasty rust cut out and repaired before it became a bigger problem. Below is the pic taken over the holidays of her just before getting fully rubbed down and a badly needed full respray. Hope to have it back in the next few days and will try get some good pics taken and uploaded then.