I used Pensacola Diesels glow plugs, theyre made by Wellman. Seem to work really well. I changed all 8 as 6 were bad, lol.
All i needed was a flex head ratchet, extensions, a wrench, and of course sockets. I didnt disconnect my steering shaft, just used a 12mm wrench. Quite easy to do actually.
Just be very careful removing them, make sure you are on them straight! If not you could break one off in the head, and that is no fun.