Yes same fitting. First range was Contour in grey 600w basic and green 800watt electronic. First electronic models were 'boost' models but this was quickly changed to electronic slider. Shortly after came the dark grey 1000watt airclean, and after that a bright red sub-basic model called Elite, which had a short rigid hose. Main issue with these cleaners was the two plastic strips which held the handle up. After a while, they wore out. Electrolux did restyle the handle lock on later models, but it still required the user to force the cleaning head down with their foot.
Then in 1994 Electrolux revamped the range. All cleaners had a foot pedal to operate the handle release. The basic models were called Contour and the TOL versions had looped handles and were called Contour2. They were also branded as "ESP" (extra suction power). The Airstream was replaced by the Airclean, and the Elite by the Twin Turbo. I can't tell you about specific models as between 1994 and 1998 there were just so many of them.
The reasons why the Electolux motors were not made to be serviced are several. It would have been cheaper and easier to build for one thing. Also, the quality of the motor was high, and parts like brushes and bearings were designed to last the life of the motor. Granted there have been many cases where the motor outlasted the bearings, but the cleaner would have been relatively old by that point. Also, from a sales point of view, motor failure was another way of making sure the cleaner didn't last too long.
Granted that Hoover motors nearly always had parts available as individual parts, but Hoover were one of the few to do this, and it didn't always mean it was more cost effective to repair either. If anything, I am amazed that Hoover of all manufacturers was the one who actually built motors in this way.
