CS 400i need to attach port plate

Bought one of these "new" on eBay and the port plate was not connected. I own one other 400i that I thought came with the plate attached? Anyway, it came with 4 screws in a sealed bag, but I want to know how to attach that without **** anything up. Do I have to remove the front speakers to get back there? It doesn't look like you can do it simply from the back of the speaker. Thanks!

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