I can post a pic tonight. Easy enough to describe though, the "chads" on the new one are very precisely cut into four identical squares per block. The old ones were jagged or blocked off entirely throughout the square. It is an improvement no doubt but the weather here is in the upper 60's and I still got a warmer than outside temperature flow. The fix works to a degree, I was just thinking that it would work better than it did. You have nothing to loose by getting it done as it takes about 10 minutes.

replaced w/ 66811-9z001 top left
66810-9z001 top right