Thanks to all!
Island: Very generous offer but 123 seats are different than 126 seats, (what I have), and I already will have good covers that only need color-refreshening.
The good news is that I am not changing colors. Just want to re-dye the exact factory color back over them. The bad news is that it's absolutely on seating surfaces. That's where it needs it most.
Angela: Nice job! I've seen other well-executed interior dye-jobs in the past, always impressive.
I'm going to research the links supplied by cbush and Eric, Thanks guys!