Product review (3 stars): Whirlpool has 2 manufacturers & 2 designs for this one product!!
Whirlpool has 2 manufacturers & 2 designs for this one product!!  Whirlpool gets a 1 star for that, but when you get the correct design for your fridge, I give it 5 stars for filtering & faster water flow!
Just to help clarify...Whirlpool has 2 manufacturers for this Filter #5 that replaces discontinued 4396508.
I learned this from another review on here that posted Whirlpool's Customer Service Rep's response.
Because of Whirlpool's 2 manufacturers, I did not risk ordering my filter online, but went to my local Lowes where they had BOTH Everydrop #5 filters from the 2 manufacturers! For my 2005 fridge, I needed the Kemflo design with the flat top with notches cut into it (as pictured above in the one pack photo & from abed's one star review photo labeled "old model" --you can see the notches cut into the right side). The other #5 design was rounded on top (no notches) and manufactured by Mexico 1 (and is pictured in abed's review labeled "new model"). It's pretty poor that Whirlpool has 2 designs listed under the same part number (Everydrop 5) & even if you order directly from Whirlpool they cannot tell you which design will ship! The Whirlpool rep said that older model fridges (8-10 years old) need the filter made for Whirlpool by Kemflo in Taiwan that is flat with the notches in it. So, look at your current filter to see what you need! Then you will at least know which manufacturer design you need.  Hope this is helpful for others!
My photo shows my old #4396508 next to the new Whirlpool EveryDrop 5 manufactured by Kemflo International.  They both have the flat top with the notches although the new filter 5 isn't really turned to see the notch. Although it took me a lot of time yesterday to figure out which filter I needed, I'm very happy with the filter & rapid water flow --It's worth it even though much more expensive than aftermarket ones.