Fusion RV-FS41SPB Sound-Panel 41mm Mounting Spacer -Black. Simply select the spacer size that suits your installation mounting depth and start your install. Use the 41mm (1-5/8) spacer to create a clean indoor or outdoor installation of the RV-FS402W / RV-FS402B SoundPanel. Install directly onto any flat surface with no cut out required. Specifications for Fusion RV-FS41SPB Sound-Panel 41mm Mounting Spacer: Manufacturer: Fusion Color: Black Package Contents: Fusion RV-FS41SPB Sound-Panel 41mm Mounting Spacer Fusion 010-12587-00: RV-FS41SPB Sound-Panel 41mm Mounting Spacer - Black