Thanks for looking in to it for me. Like I said, it's not the end of the world if all the piece numbers are jumping from one piece to the next. But, on the larger floors or systems with lots of duct work it's easier for the field guys if the part numbers are closer together. It's also our shops preference to have identical pieces to have the same number. So, that's the reasoning why we like to have both options. Again, we really appreciate all the help!