Thanks ParaPaul for the link. If only i'd seen these earlier then I'd have bought these instead of forking out for the Earthquake subs (which worked out a fair bit expensiver - especially with the potential Customs charges i'll be slapped with as coming from the US).
I think those spacers are for round subwoofer units. The Earthquakes are already shaped to fit the enclosures but need a spacer to prevent them hitting the OEM grilles that mount on top.
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