I am baffled by claims that this item will fit Miata 1.6 NA. I've even seen a claim that it fits another 1991 like mine. The product may have changed or there were several versions. I don't know but I've tried 2 of these and I'm telling you they don't fit. You can EITHER insert the sleeve into the hole in the valve cover OR you can insert the PCV valve into the sleeve (as long as it is outside the hole). But if you try to do both at the same time, the sleeve will break. It doesn't matter how much oil you poured on it. There is a much better piece, Beck Arnley 039-6428, which fits snugly but is still quite tight.
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