Just to help someone solve the same problem I was having this part was a direct replacement for the heat mix actuator on a 2008 Hyundai Entourage Limited. I called NAPA and my local Hyundai dealer and no one could confirm the part number for this replacement so I went to photo one. On the box this part is marked Dorman 604-307 but inside is a Woory "HVAC ACTUATOR WOORY AC1C6100" that I pulled from my Hyundai. Weird part of the bug, but it was a fix for the loss of temperature control between the two zones. I'm posting this comment in hopes of sparing someone else the same frustration of trying to find this part. Many thanks to Revain and the seller for posting clear enough photos that I was able to order it for looks alone.
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