Originally Posted by neauone
Did you determine the size of the bulb by determining the depth of the door entrance by the fiberglass depth?
The bulb diameter is determined by the seal gap, which may vary around the perimeter of the door opening. One way to measure the seal gap is to buy some modeling clay then build and stick little cones of clay around the door perimeter on the sealing line. Gently close the door until it just clicks shut, then open it and measure the height of the compressed clay cones. You want a seal that fills the widest gap but that is not overly compressed in the smallest gap. You may need to adjust the door if your gap varies too much around the perimeter.