are you talking about 1000 2 door sedan? i was going to put a ute diff in my 1000, becauser the A14 turbo kept spiting axels and diff like there was no tomorrow, the H165 is wider than the 1000 diff, i'm told that the 120y diff centre fits with a 2mm spacer, that will make the diff a bit stronger. to fit a H165 in a 1000 you will need to get a bluebird diff and get it shortened and new axels made up, other wise run flairs on the rears.