I ordered this item based on the description and claimed the gaskets were a 5-3/4" ID. The spacers I received did not have a 5-3/4" ID. The actual ID was 5-7/16". As another reviewer mentioned, they don't fit MB Quart 6-1/2" speakers by default. I was able to get them to work by scraping off the top and inside edges a bit with a dremel.
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