Product review (5 stars): Perfect fit but spins faster, so expect more noise unless you get a smaller fan.
I bought this replacement Fan Motor for my 2002 SubZero 680 and it fit perfect.  The area between my refrigerator side and freezer side was heating up as was the frame near the vent.  I noticed that my original fan was not spinning and would start only if I flicked the blade with my finger...I assume it got too gummed up inside due to dust, etc.  So I ordered this motor to replace it... and it worked great, with one exception.

The issue I had is that it is noisy compared to the stock unit (it turns 200 rpm faster).  I initially thought that was no big deal, but since our kitchen is near the living room I could hear it too often (like someone left the range fan on).  Anyway, I search and found a replacement fan that completely eliminated the issue (now the sound level is normal, quiet).  I ordered the 3 blade Scotsman 18-3710-01 Fan Blade on Amazon for $10 and it fit perfect.  It looks like it would be too deep (wide?) but fit w/o issue.