@YYZRC , the one that @earl1z19 posted is the wrong size. I ended up ordering a normal close lid. I don’t remember where I ordered it from. Here are the measurements if you need them.
On my previous boats where the hinge broke I was able to go to Home Depot and buy a cheap seat, and just take off the hinge and put that hinge on my existing boat seat to replace a cracked one. Would be worth looking at for slow close....
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https://www.campingworld.com/slow-close-seat-for-dometic-310-toilet-white-96154.html?gclid=Cj0KCQjwrrXtBRCKARIsAMbU6bHVIVL6fVAODHqN5iJqrkVNS4-PefOf6NszBzDLNs7gaFQsTB2HZOcaAmmbEALw_wcB
Cheers!