I bought a new old stock Thetford 35 on eBay for my M-15 #249 last Spring. It fit perfectly. There is lots of discussion of this topic on the group site. I felt buying an old one that would fit was the best solution for me, and was delighted to find one. I expect the seller was mighty pleased also. My boat had come with a Sears potti that was a bit too tall, and likely was the cause of the wooden cushion frame being broken. Ron Stanton M-15 Bonaventure Michigan In a message dated 2/16/2008 2:03:59 P.M. Eastern Standard Time, kdocter@bellsouth.net writes: Kendall Docter M-15 #164 I'm looking for a used Porta-Potti for the M-15. I remember reading somewhere that Jerry was surprised when Porta-Potti changed the dimensions. He suggested that guy put really hot water in the Potty and force-mold it into the hole, which apparently worked. The dimensions I was given don't come that close to me seeing that trick work. There is a used one on Bay and I'd like to bid on it, but the measurements are too big, and it is the right model number. Maybe the woman didn't measure correctly. Any suggestions? _______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats **************Ideas to please picky eaters. Watch video on AOL Living. (http://living.aol.com/video/how-to-please-your-picky-eater/rachel-campos-duf... 2050827?NCID=aolcmp00300000002598)