Yes, there certainly is,,,besides the Janitronic, there was a model called the Super Sweep, and maybe one other.
They were manufactured by Scott and Fetzer (the maker of Kirby) in the mid to late 1970s,,,the motor of the machine is the same as a 500 series Kirby, but the rug nozzle is extra wide, and the handle bale and handle grip are the same as a Kirby Classic.
The rug nozzles to these machines were not detachable, and no attachments were avalible, unlike any other Kirby (more like a Royal),,at least of the ones ive ever seen.
Ive seen one Janitronic that was green, motor,rug nozzle, and handle bale,,the handle grip was white.
Ive also seen a Super Sweep that was blue, with a red, white and blue bag,and handle bale, and white handle grip,,,im thinking this model came out in 1976, to coordinate with the Bicentenial colors of the time.
These special model vacs were mostly used in industrial/commercial applications.
I do know that the brush rollers that were extra long of course, are no longer avalible.
If you keep an eye on E-Bay, you will find one for sale every once in awhile. I have seen at least 3 for sale on E-Bay in the last 5 years. Hope this helps you, Brian