I ordered all 8 new glow plugs from Rock Auto. Just got them in today. I will keep the 3 that I already replaced for backups, and put all new glow plugs in. It seemed that I was getting a glow plug code one at a time for a few months. Once apart, it is easier to change them all out. I did not want to get these codes in the winter and have to do these then, so I opted to change all of them on my terms.
I still wonder it seems like I was getting 1 a month. In the summer, when the plugs do not even cycle? I will put the "bad" ones on an OHM's meter and see what they meter out at just for shits and giggles.