Changed 'em today with autolite HT0's
. All eight came out fine after some research, I just over-tightened slightly, then less than a quarter turn out for each, PB blasted, waited 10mins, not a 1 broke.
Got the tool just in case though from amazon. 63.5k on the car, and yeah, they looked like absolute crap. Surprised they still worked ok to be frank, most of the electrode was gone on all of them. Completely coated on the ground shields with carbon build-up. Glad that's done.
Friend and I, (on the forums here as well) did ours at the same time, which came in handy since we both "hur-der'ed" and forgot to get a 10' or better extension, and didn't have a 15mm Plug socket.
I did however, bust one of the stupid little molded in retainer clips for the injector connector putting it back on, so if you disconnect them to get them out of the way, be cautious putting back on, very cheap molded plastic.
Working great from what I can tell, even at the factory gap of .045..
How to change spark plugs in a mustang - YouTube
Just ignore the part about putting anti-sieze on the threads..