Sealand Concerto Toilet.
Camping World sells them but you will also need to either change out the floor flange from the custom thetford one to a normal one or purchase an adapter. They come in two colors, white and bone.
I did this many year ago after having so many problems with the Aria II thrashing machine however I was lucky to find a Sealand Magnum Opus model. It's been over 6 years of wonderful bliss not having to constantly repair the toilet or not being able to use it at night due to the noise it makes when flushing.
Dr4Film ----- Richard