I checked and Igor Camera still has a complete #8 with lens, tripod, gears and keys. The problem now is getting film. My friend who wound up with one used 220 film to test lenses in hopes of finding the correct one. I guess now you could get Ilford to coat some but you'd need a couple of film spools. If you had one you could have them machined I guess. I'm not sure if the group still exists but there was at one time a panoramic society. You might Google it. Seems like it was out of Florida but not sure.
If you are serious about doing 360's on film, look at a used Roundshot. The company is still in business and making very expensive digital systems. There were several models made. I had the 35/35 and there was a 35/35s. The S had two motors, one for upper speeds and one for very long ones. I failed to mention these are electric. There was also a 120/220 model that had interchangeable lenses. They only worked with a 28mm and came in Nikon and Leicaflex mount. The Nikon was most popular because the 28mm PC lens had huge coverage and worked better.
There was a 65mm version too with fixed lens and a version that used different FL lenses. I think it came in Mamiya medium format mount and Nikon and seem to remember Hasselblad mount. You could use different FL lenses and program the computer for the lens so it would rotate on the lenses nodal point. If it wasn't rotating on that point the neg would just be a blur. I think this model took 120/220. It might have come in 70mm but not certain. I think there's one on eBay right now.