Product review (2 stars): CAUTION!!!
Was disappointed for 2 reasons...First, the Warning Label about Cancer and Birth Defects...didn't see that on the Amazon web page description.
Second, I didn't realize that this model didn't have the aluminum webbing for reinforcement/shaping...it is difficult to shape and get into place and put the unit back on top of it.  I made the mistake of leaving the water in the unit when put this in...when it got wet, it started collapsing and wouldn't hold shape, so if you get it, be sure the unit is dry when you install.
I got back on Amazon, and found the replacement I meant to buy that has the aluminum reinforcement, it is from Air Filter Factory UPC 842477101862 and costs $15.77 with free shipping.  Much better product.  You do have to trim the length a little, but the width/height is ok.