Correct me if I'm wrong on the air system???
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These caps did have an inner lip on the back side of it that I thought might catch hole and stay. Since the neck of the lid is curved this didn't work. I took one that was slightly larger than the hole centered it and secured it with some gaffers tape. I then placed just enough (5 min) epoxy from the inside of the hole to fill the vacant area inside the cap and up in to the inside of the lid. The epoxy dried almost flush with the inside of the lid. That inner lip aided the epoxy in holding on to the cap. I feel that if the cap was smooth then the epoxy would have been able to adhere to it.
See the attachment for what it looks like on the outside. I guess if you go to an auto parts store you can find these style of caps.





I did the same. Found a small screw with a big head, but i put some RTV on the screw before putting it on. (cause im paranoid)