Oval tight-sealing rubber hatch made by Point 65.
Size #1 fits:
Front & aft: FREYA 18; XP18; Whisky 16; XO13; XO17; DoubleShot; SeaRover.
Aft: XO11; Martini; Mercury; XP Classic; X-Ray; X-Lite; XO16; XO14; Picnic; Nemo; Fasthing.
Size #2 with slightly different proportions fits:
Front & aft - SeaCruiser
Aft - Five-O-Five
Care instructions - Keep indoors during outside temperature below 0°C. To loosen and smoothen apply silicon.