Product review (5 stars): Seller went out of his way to rectify mistake.
Thia Aprilaire 45 Replacement Water Pad- Twin Pack [Misc.] that they describe on Amazon might not be what you receive. They describe the pads as 13.5" X 10.5". They also say it is a "twin pack" which, in actuality is two pads that are actually 7.5" x 9.5" each.
When I put the two pads together I got 15" X 9.5". I cut the 15" down to 13.5", which I needed. I am short in the other direction. I need 10" and have 9.5".
I am not happy with the way the vendor describes it versus what I actually received.

UPDATE 2/17/2012
After contacting seller concerning the above problem, they replied very quickly. Withing a few days i did get the correct item. The new pads fit perfectly.
The seller was obviously concerned that the wrong item was sent and wanted to rectify the problem immediately. For this reason I am changing my 1 star to five.