Application: Peterbilt 380 series truck including 387 cab dome light
Mount: double stick tape which is included, or you can use a silicone adhesive which is not included
Size: the two rectangulare holes are 2 3/4" tall and 3 1/2" wide; the single hole is 1 1/2" tall and 7 1/8" wide; the overall size in the middle is 5 3/4" tall by 9 1/2" wide.