Wellcraft Excalibur hull vents
#11
Do you have one of the vents? I know a good fiberglass fabricator could make a mold and create new ones fairly easily, but you'll definitely be putting some money into it. Or.....if you have somebody with a big enough 3d scanner and printer, you could print new ones (use ABS), keep the file, and use as needed or share with others who might need the part.