Our "new" 1988 E34-2 is bit of a mess and the first project before the First Mate comes aboard is a clean and functional powder room. Looking online I found the JABSCO Twist 'n' Lock Compact Toilet is inexpensive, $162, and has mostly positive reviews. The mounting holes are different so after some drilling, the deformed ends of the hoses were cut off, new hose clamps were added and it's ready for inspection! Note, it is less work to attach the hoses and clamps before installing the mounting bolts. Cheers!