Class A Customs 17 x 25 od Trailer New Skylight Plastic Lexan Polycarbonate rv 14 x 22 ID CLEAR NO SHIPPING TO ALASKA, HAWAII, PUERTO RICO, or USVI. Color: Clear Mounting Flange Is Pre-drilled For Easy Mounting Inner Dome Dimensions (this is roughly the size of the hole you will need in your unit): 14 1/8" wide X 22 1/8" long Exterior Dimensions: 17 5/8" wide X 25 9 /16" long 5" tall