This is indeed a very quick easy job and a big upgrade. I've been running pencil plugs in my '79 for two years now. Did mine after the #5 cylinder loop plug burnt in half, disabling the entire glow system and blowing the 80A fuse.
I made my own wires; simple, really. Use 10 gauge wire, anything higher is too thin. Then just crimp on some round ends and you're set.
These are good instructions:
Mercedes Diesel Glow Plug Repair
Glad you've shared your experience.