i have a 1981
casita 13' trailer that has a leak around the vent, tried to fix it with butyl tape but that didnt work and i now need to replace the vent. doesnt look to hard just want to know where i can buy a vent that will fit my measurements 14" by 24", most of the vents i am seeing are 14" by 14", can any one give me some ideas? thanx gator