Start with your dealer - Katzkin customer service did not seem to want to help me.
My dealer (new truck) offered to pay for Katzkin seat leather install since the truck I'm buying doesn't come with the color of leather I wanted. Of course, they won't pay for a full blown custom install (every possible option and premium upgrades), so I called Katzkin customer service to find out the differences in the leathers and which ones would cost more/less, which ones could be perforated for ventilation, etc. so that I'd be ready to have the conversation with the dealer. Customer service was of zero help. Just kept telling me to negotiate with my dealer and rushing to hang up. Thanks for nothing. A real turn off. I called today and explained my experience. Appreciate the willingness to listen.