Finding parts for a Maytag Neptune top loader is more difficult than finding parts for 1966 to 2006 Maytag Helical machines.
If something was in production for many years and was popular, it’s going to be fairly easy to find parts. But when you have something that was a niche product and was more experimental more than anything, finding parts is going to be difficult, if not impossible.
The Neptune top loader was only in production for a couple of years before Maytag ended closing up shop in 2006, the Neptune front loader was more popular but even then locating parts is difficult for those as well.
While the Neptunes were interesting machines, they are too restrictive for my tastes. Should be able to choose the agitate and spin speeds along with the wash and rinse temperatures, water level for sure. My Maytag 806 and soon to be Whirlpool Imperial Mark 18 set gives you the ability to select everything independently, definitely will put the gentle wash with fast spin to use on the Imperial Mark 18.