Islander 28 holding tank

[28islander]

Hi, I also posted this in the Islander forum. My islander 28 has a holding tank under the starboard settee. Currently there is a very old flexible tank that measures about 27" X 33". Pretty sure it is the original tank, in there since 1977. I would like to replace it with a rigid tank. I have looked through the Ronco catalog and could not seem to find one that would fit into the space. I am hoping someone that has or had a 2I8 that has replaced their holding tank or has a rigid tank can help me with particulars on locating a tank to fit. Where did you get your tank? If through Ronco which tank was it? How many gallons? Was it custom made? Any pictures of the installation? Thank you in advance for any help.

[JimsCAL]

I replaced the bladder holding tank with a rigid one on my previous boat. I just took measurements and bought the largest Todd that would fit. Had to build a shelf to hold the tank and a needed a fitting relocation kit. Also required a bit of surgery to the V-berth top to get the tank in. A lot of work but the rigid tank was a big improvement over the bladder.