Ocean Breeze Marine Speaker Spacer f/Wet Sounds RECON 8 - 8" Series Speakers - .50" - BlackSpeaker Spacer for Wet Sounds RECON 8 8" Series Speakers . 50" Black Don't have enough depth to install your speaker subwoofer? Problem solved these spacer rings give you that extra space needed to mount your speaker subwoofer. Specifications: Thickness . 50" Edge 1 16" Round Outer Diameter 9" or 229 mm Bolt Hole Circle Diameter 8. 11" or 206 mm Mounting Hole Diameter 7. 25" or 184 mm Compatible With 8" RECON 8: RECON 8 XW W RGB and RECON 8 S RGB