I though that was the bottom line, but I must say that the entire mess is now firmly in the quicksand because such a change runs afoul of this other rule, 9.1.3.C which says in part, "To maintain the stock basis of Improved Touring, UPDATING AND/OR BACKDATING OF COMPONENTS IS ONLY PERMITTED WITHIN CARS OF THE SAME MAKE, MODEL, BODY TYPE (E.G., SEDAN, STATION WAGON, CONVERTIBLE, ETC.), AND ENGINE SIZE AS LISTED ON A SINGLE IMPROVED TOURING SPECIFICATION LINE." (Caps added for emphasis.)

It seems to me that the mix/match approach runs afoul of this rule specifically. What a mess.