1990 H40
has three different lights in the aft cabin. The ones above the bed (under the seats in the cockpit) are Bomar. 9 1/4"x 9 1/4" and the part numbers on mine are # 89018820 and # 89018818.The ones on the hull above the hanging lockers are Lewmars, 12 1/8"x 5 1/8" the same as the one in the head and above the galley.The others looking out into the cockpit are Beckson's 14 3/38"x 4 3/8". When these leak the water runs between the deck and the liner and comes out the steering inspection plate above the bed. There are no screws to tighten. The outer frame is sealed to the deck with bedding compound, as it gets old you end up with a leak. Had to rebed both of mine.All the measurements are approximate glass size it turns out you can't measure the size unless you have the frame out because they use the hole size required as the size of the hatch.Hope this helps.Vinny