when i got my car the last owners must have attempted a tune up, but only changed one rear plug, 2 were way older looking and a different brand all together.
unbolt the dog bones then with a ratchet strap pull the engine forward this will give you a good 3 inches of extra room, enough to see the plugs now.
the middle rear iirc is the one blocked by the o2 sensor, i put the socket on the plug, then was able to just put the tip of a 3 inch extension in the socket, then broke it free. you'll see what i mean when you get to that plug.
or if you have real spark plug sockets that have a bolt head at the top, use a wrench on the plug socket to break it free.
