for that back plug you cant really see under the alt. take just the socket and put it on the plug, then use a 3 inch extension and the ratchet. its kinda a blind plug. but once you figure out how to get your arm in the right place its easy.
the middle back one is also semi blocked by the o2 sensor. again, put just the socket on the plug, then what i did was to slide the extension past the o2 and catch just the tip of the extension in the socket. or if using a real plug socket, its got a hex head on it, use a wrench on the socket to break it free.
