OK, scratch that. I am seriouly dissapointed the Pro Comp doesn't make a wheel to fit my needs, but I found this one:
I want to put Pro Comp Xtreme At's in 35x12.50x18 on Eagle 063 18x9. They have the 4.5" backspace that I need. Of course that center cap will have to get powder coated to match.
Hopefully it will have a similar look to this: