Product review (1 stars): They also said that the only parts they have to sell are exactly like the one that I was trying to install
Purchased a replacement water filter at Sears and was unable to install in Samsung refrigerator.  Directions say to twist the filter into place aligning the "lock" mark with a line on the filter housing.  The filter snaps into the housing but will not turn to match the housing alignment mark.  Strong force on the verge of breaking breaking the plastic housing was not successful.  Contacted Samsung and they suggested purchase of a new filter from them or pay a technician (est. $100.) to install the filter I purchased.  I contacted the Samsung parts department by phone was told that many people have this problem.  They said that in a redesign, these parts no longer fit into the water filter housing.  I should turn with more force until the filter turns.  They also said that the only parts they have to sell are exactly like the one that I was trying to install.
If the filter is snapped into place but not turned to the alignment mark, water passes through the system but does not actually go through the filter. I would imagine that some filters are installed this way and the customers are not aware that the water is not actually filtered.
I was able to successfully (?) complete the installation by using a box cutter to trim a plastic protrusion on two sides of the filter.  There are three of these on two sides of the filter and I trimmed the longest one assuming that it was too long, preventing the filter from being twisted into place.
By the way, I did contact the Samsung service company and when I explained the problem, they responded with: "we don't do installations"  and hung up.