Using mustang rotors for 4.5" bc

There's a bearing place here where I live that is renowned for coming up with just about anything you need. They've been in business forever in the same location. I'm just not up on this stuff, although I do have the KH discs on my car. If you had the exact dimensions needed I could go visit them and see what they've got. They might just be picking from the same suppliers as your place, but you never know. There's a lot of parts here in Canada (mostly Magna made) that maybe you don't have down there.