Anyone know the correct toilet for a 1974 Argosy 24' and where I could get one. The P.O. installed a Thetford and it is too tall so He removed the back pad and the toilet cover to make it fit.
From your photo, it looks like the installation in your coach is very similar to that in my '78 Minuet. My Airstream dealer replaced the original Thetford toilet with a new Low-Profile Thetford Bravura (closest in dimensions to the original) - - it is slightly taller than the original but it does permit the backpad to remain and operate as a storage cubby - - the Minuet didn't have a toilet enclosure (at least not anything approaching the complexity of the enclosure used in my '64 Overlander).
The one thing that was necessary with the new toilet was modifying the base over the holding tank. The Bravura has a larger "footprint" and required extending the black water holding tank enclosure box by a little more than an inch to provide some additional suport for the base of the toilet. I should be able to post a photo of the installation tomorrow if the weather clears.