Don't recognize the potty, but that may be because my head won't rotate on my neck enough to actually see the picture.
You're talking about a bunch of blown seals, and I've been there with my O.E. 4500 potty. Fahgeddabout replacing the seals...cost you as much as a new unit, especially once you consider the nasty
factor involved with replacing some of those puppies.
A hundred bucks or so will get you a new Thetford 135
, which is the closest thing to what you have, size-wise. It will fit in the cubby, and that's what counts.