Either they sent the wrong item, or the wrong item was ordered with the set. The listing I ordered from specifically stated QED split chainrings, meaning they were 2 split pieces. Yours is a 1 piece spider and chainring, meaning that you would have to remove the powermeter spider to install/use them.
Since you say your seller is gone, I think your only options are to either run the chainrings (and not have the powermeter), or sell them for a little bit of money to offset the price of new 110mm, 4 bolt, Simano style asymetrical rings.