The 351(20Hx18Wx20D) has been remodeled a handful of times over the years and now is the NR 751 BB( 20.5"H x 18.5"W x 21.06"D).
http://www.wholesalemarine.com/p/NOR-NR751BB/Norcold+3.0+CF+Built-In+AC-DC+Refridgerator-Black+Front.html If you have the depth this fridge can be flush mounted or can be mounted the traditional "proud" mounting style with the door sticking out.
We installed this fridge a couple of months ago and have been very happy with it so far. It has a cool blue led interior light, and more inside space than the DE0051 it replaced. If you decide on this fridge don't forget to order the AC power cord since it doesn't come with one.
*edit. You have no idea how confused I just got because I answered your question here
http://www.smwebhead.com/phpBB3/viewtopic.php?f=2&t=11547 and thought I didn't submit it correctly so answered it again here.....I think it's time for bed

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2005 268 Vista "Sea Pickle II"
1979 AMF Alcort Puffer
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1973 Startcraft 18ft "Sea Pickle"