Pick a vintage and look at the manuals. A S/N starting with a 7 is a 2002 for reference. For the most part that mowers hydro package hasn't changed much over the years. If a dealer had a new one on the show floor it would be very close on how the lines run.
Looking for blown Kawi 29HP DFI engine's fd791d, whole thing, intake, throttle body, and electronic's. PM me if you have something you would like to sell.