Sound-panel mounting spacer white 41mm. Use the 41mm (1-5/8”) spacer to create a clean indoor or outdoor installation of the RV-FS402W Sound–Panel. Install directly onto any flat surface with no cut out required. Simply select the spacer size that suits your Installation mounting depth and start your install. Package Dimension : 4.572 centimeters L x 21.59 centimeters W x 48.006 centimeters H