2000 340 SD Refrigerator(s) Replacement

You may get more relevant hits if you identify as a 340 DA SD is a Sundeck. Us Dancers are all DA's.

That photo makes me think Isotherm. I put one in my cockpit and it's been solid...

 

Check out Defender Marine. They are generally great to deal with. They'll list the dimensions of all the models. Some have the ability to remote-locate the compressor to give you more room, if needed.

 

That is a an Isotherm fridge. I installed one in my cockpit as well, and it is an awesome fridge.

However, the issue I have with the Isotherms is they are just slightly thinner than the Norcold that was likely the original fridge. So yes, you will have to shim or otherwise make some piece of filler. Its just enough to be a real PITA unfortunately. If you go with Isotherm, I found marinewarehouse.net out of FL to be the lowest cost option and their shipping is the lowest as well. I bought my Isotherm from them, and they do a great job. I had mine shipped to a local freight yard and just picked it up myself. A lot cheaper than residential delivery.

Check out Nova Kool. Their website has a cross reference for about every fridge in the RV/Marine market and I have found their specs to be spot on. I replaced my galley fridge with one of theirs on it is a great fridge as well.