Product review (5 stars): Fit my Samsung just fine.
These fit our Samsung side by side perfectly.  There was some pressure on my line when I had to jam this filter in, but I just flexed and was able to get it in there.  You know, sometimes you just gotta man up and flex before stuff starts to happen.  :)

They seem to filter the water just fine, and they're WAY cheaper than the Samsung brand.  I think those were like $45 each or something.