Manual or electric?
If manual, the Raritan PH II is your best choice. If electric, you want the Raritan SeaEra. It's designed to be an identical upgrade/replacement for the Jabsco 37010 electric...even the mounting bolt hole patterns match. Or, now would be a good time to upgrade from manual to the "push button convenience of electric--and even pressurized water flush...the Sea Era is available in both raw water and pressurized water models, and also as either complete toilets or "conversion kits" that would let you save money by recycling your existing bowls.Link to the Raritan website is below...you can check out the PH II and the various versions of the SeaEra--including the manuals for both--there.In either case, installation of any replacement toilet is the same: close the seacocks, remove the mounting bolts, disconnect the inlet and discharge hoses (and any electrical wiring)...set the new toilet down to figure out where the mountng bolt holes have to go. If the bolt holes aren't a match, fill the old ones (it's a good idea to do that even if they do match, so the new bolts can be sure of getting a good "bite"...you don't want a wobbly toilet)... bolt down the toilet and reconnect the plumbing and any wiring.