My Z only had 100,005 miles on it when I replaced the interior. And the original leather was in pretty great shape - good enough to sell if I wanted. I still have it all on hand. The driver bolster was slightly worn, but not by the typical idea of worn when you think of a Z. It was all about refreshing the interior and the overall look/feel. But the bolster only needed a little transplant cushioning from another seat back I had laying around.