Hi. I have a standard cat SIT. It came with a wing tank plummed for fuel, and some very nice drawings of the plumbing lay out. I know a few SIT`s came from the factory with the top wing plummed to a smoke system. To ease the path of the 337 I must file to install a smoke system, I am trying to find out if anybody has drawings of the factory set up. Aviat say they can not help (or will not?) If there are any drawings/diagrams out there I would be very grateful for a copy. Failing, that if the factory provided a writen description of the systems they fitted it would also be helpful. Many thanks.