Product review (4 stars): As good as the vendor...and less expensive.
Sears , give up on the parts business .  From Sears this part for my Kenmore refrigerator  (which chipped when something fell out of the freezer side, but that's a whole 'nuther story) was over $20 plus shipping.  I had to play with it a bit to get the cap to hold the filter before I put filter and all back in, but it does the trick.