I ordered a transmission drain plug gasket and got a Dorman 65408 which cross references with OEM part #90528145. This is not the right part. It's a gasket about the size of a nickel. It does show it's for the CTD but I don't know what it's for (definitely not transmission drain plug though). It says oil pan drain plug, but it's not that either. Here is a picture of the same seal with OEM part #.
While I'm dealing with how to send it back for a refund, I'm really curious what is this for on our cars? Is it maybe a seal on the transmission fill plug?