The wiper with spoiler goes on the driver's side.
You are not alone with a warped plenum cover.
I reckon nearly all are like that, even if they are not cracked or broken.
The only downside I can see , is that if the car is parked facing uphill, water can enter the ventilation opening which is on the passenger side , and you will have a wet floor after rain. The steel panel under the plastic panel has drains so water is expected to get through.
There is a fix to build a little dam around the opening.
I sikaflexed the seal onto my screen when I fitted a new/old plenum cover but still had some water in after a big downpour .
Regards Philip A


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