Ben, Tom
I do not have a pic of the top of the drain tube, but if you will look in the top storage compartment, just to the outside of the top mounting bracket, in the forward most corner you should be able to see the top of the drain tube. These tubes are often deteriorated to the point they are no longer servicable. They leak. Using a wire or other metal object will most surely punch a hole in the rubber tube. Water leaks from the tube and accumulates under the kinder seat foot well or under the shelf if you do not have the third seat. Either way the water cannot get out and rusts through the metal. The last time I checked, rubber tubes are no longer available. I solved this problem by going to the plumbing department of the local building supply store and finding a metal tube that I could modify and use for a drain line. It just happened to be a feed line for a commode tank. I trimmed the flange of the metal tube so it would fit into the recess where the original rubber tube fit and cut the tube to about 2 inches in length. I used an appropriate diameter plastic tube to run from the metal tube to the inside of the quarter panel as shown in Tom's picture. I sealed flange of the metal tube to the storage compartment with 3M Heavy Drip Check Sealer. The plastic tubing is pushed all the way up onto the metal tube and held in place with a hose clamp. Remember also, the metal flange should be recessed lower than the surrounding area. Otherwise water well still collect inside the storage compartment.
On the subject of primers. DP40 is great stuff. The color is red oxide. I use DP 90 mostly. All the same good qualities as DP 40, but in a semigloss black (NOT FLAT BLACK) color. The paint is a durable as a top coat and is ideal color for the inside of the trunk, top storage compartment, grille parts and the rocker panels.
Good luck.
Iverson