Mark the center of the tube and then mark on the tube where it would exit the fuse so you know how much would go into the wing as is. Just lay it on top and take a pic.
Socket into the wing is 18 1/4 inches deep and the width of the fuselage is 6 1/16 wide at the location the tube goes through the fuselage. The tube is 36 inches long. Therefore 18 1/8 times 2 is 36 1/4 and the fuselage is 6 = 42 1/4 long. So 42 -36 = 6 short total or 3 inches short per side. Will get a picture later not able to do it right now
My tube is 36" long as well, the socket material is shorter than the tube by several inches so there's no way I could make 18 1/4" sockets unless there is another socket in the kit. It is below a cardboard separator in the box and didn't want to take all the wood out to have a better look.