Randy, you have a sharp eye. Indeed I goofed. it is the calipers that have that different offset.Chuck, looked closely at your link and I have a question. You said "the really good news is. that the offset dimension on the replacement ROTORS is .23 inches less than the calipers provided by RCR..." Is that suppose to say "replacement calipers"? You had said the only purchase was new Wilwood calipers, did you also purchase replacement rotors? As I have no car as of yet, I am attempting to visualize all this in my head, and that is not an easy task. Would hope RCR would be aware that there is a problem and provide the proper calipers, spacer and instructions? Hopefully Doug can get some answers.