Anybody that has a SeaLand 911-M28 Traveler Toilet you cannot get the bottom tray ....jonathon at casita
said a whole new toilet is required ..... i heard him shout over to jay on the phone to double check.
and sealand/dometic also told me no
I sent my tray to a fiberglass repair shop and for $75 it will be as good as new....
they (Casita)also said that there is no gasket between the two halves and that you run a bead of caulk around the inside flange where they meet..... and install.
Thanks everybody for your help.