Mislabelled but great product. The ideal enclosure diameter for your speaker is 150mm or 5.9 inches. There is an "outer" edge, but my calipers don't go that far; I would venture a guess that 6 inches on the nose. Bolt diameter approx. 140 mm. This spacer fits the 6" Dayton RS150P perfectly, allowing the driver to protrude 1.64" into the door. It also has corner cutouts for 4-hole drivers. Should be marked "1" spacer for 6" speakers.
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