Do you people think I am a liar or something? I'm well aware that the diameter of the crown wheel is 145mm and that you should use a 2.5mm spacer. I never fitted the wagon with the diff. I only dismantled it. Not once have i said the diff gears or housing are genuine Datsun. When someone is selling a house do you guys dispute why they paid for it what they did or why that wall is that particular colour? So here is the diff for sale, if you are interested in it please pm me. Thanks.