A panel door includes a pair of compression molded plastic door skins that sandwich a core therebetween, the skins each having a plurality of panels and each panel bordered by integrally formed, raised trim. By cutting along the raised trim and removing the panels associated therewith, on both sides of the door, an opening is formed through the door. The opening is peripherally bordered on both sides of the door by a raised lip left over from the uncut, raised trim. A pair of door light rims sized to fit the opening are connectable from opposite sides of the door to grip a door light within the opening. The rims have outer clamp perimeters that seat outboard of the raised lips, which serve as in-situ locators for mounting the door light rims.