I just got my head back from the machine shop, and I'm desperate to get it on the car today. I checked the back of the head and it's got one plastic piece near the back coolant hose, yet the other side is open. Here's a pic:

Do I need either one? Or two? Am I missing one? I can't find anything on realoem...
Thanks in advance.

Do I need either one? Or two? Am I missing one? I can't find anything on realoem...
Thanks in advance.
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