Custom Skylight Dome 900mm Skybrite Replacement Skylight Dome 300mm Vented Skybrite Replacement Dome For Tubular Skylight All Sizes Skylight Dome Replacement and Replacement Diffusers Skybrite Tubular (Round) Skylight Replacment Dome (12 1 4") (19 1 2") (24 1 2. Natural light anywhere you want light! You wont believe the difference skylights make in your home. For more than 40 years our all American made skylights have been making homes look brighter and more cheerful and even bigger. Sun Tek replacement domes are available in 10" and 14" diameters and fit most of the existing kits on the market today. Image is for illustrative purposes only and may not be an exact representation of the product.