I have an Epi sg-400 and cant find accessories to make mine look similar to angus young's. I would like to put a "whammy bar" and the big chrome piece on the bottom of his guitar. Sorry if im not using correct termonolgy but i think you know what im talkin bout.
I believe that what you are looking for is a Bigsby tremolo bar and tail piece. It has been a while since I have seen Angus' guitar so I could be wrong though.
You need a bigsby, it'll cost about 200 for the bar and installation.