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Siding Mounting Block, Octagon Siding Mounting Kit with Built-in Electrical Box, 8141 Vertical Siding Lamps Mounting Plate Siding Light Blocks for 1/2 inch Lap Siding, White : Amazon.co.uk: DIY & Tools
Siding Mounting Kit, Black Outdoor Light Mounting Block with Built-in Box, Siding Mounting Plate for 1/2 inch Lap Double and 4 inch Siding : Amazon.co.uk: DIY & Tools
PPG 5/4 in. x 7-1/4 in. x 11-1/4 in. Artic White R&R Large Light Mounting Block 3-5/8 in. Hole - Smooth Siding Accessory AWS098LL - The Home Depot
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Siding Mounting Kit, Black Outdoor Light Mounting Block with Built-in Box, Siding Mounting Plate for 1/2 inch Lap Double and 4 inch Siding : Amazon.co.uk: DIY & Tools
Siding Mounting Block, Octagon Siding Mounting Kit with Built-in Electrical Box, 8141 Vertical Siding Lamps Mounting Plate Siding Light Blocks for 1/2 inch Lap Siding, White : Amazon.co.uk: DIY & Tools
Making mounting blocks for light fixtures in General Woodworking
Siding Mounting Kit, Black Outdoor Light Mounting Block with Built-in Box, Siding Mounting Plate for 1/2 inch Lap Double and 4 inch Siding : Amazon.co.uk: DIY & Tools
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electrical - Trim piece to allow flush install of exterior light with surface mount box - Home Improvement Stack Exchange