Are you looking on what you have or trying to find out if this will fit... if it's the latter you should just be able to Google hp part # and see if it will fit
I don't know what the part number is on mine. On the square looking box it has 2 numbers. One is Rev A04 or AD4. (can't see it well) below that the number is 3403164102. Then there is a bar code under that with a long number & letters. My power cord no longer works and I'm searching for another one. TIA