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Cucvelectric is a good place to start, but as I recall, they are nothing special. The stock glow plug terminal is actually smaller than most spade terminals. I would think that any auto parts place will have them. Heck, even Home Depot should have them.
Sounds like you are on a good path to getting your GP system up to snuff.
For mine, I pulled the rear battery and tray to gain easy access to the right rear glow plugs. This also allowed me to repaint the battery tray. Even though I had a bad plug, they all came out easy.
I replaced them with...