Ok guys, Update on the Auto Hub situation. There are Auto Hubs fitted but the last owner removed something out of one of them as it was making some 'noise' when driving, he has misplaced the item, so I am looking for a replacement.
I have removed the hubs to see the difference and I will try to describe the problem.
When you remove the retaining bolts for the hubs and withdraw the assembly, it comes away and there is a loose part fitted between. I understand that this is the part. (I will clean up the Hubs and post a photo of the offending item when I can). What I need to know is, can this part still be bought (at a reasonable price) from Nissan? Sorry for the rather vague description, but I hope someone can understand my ramblings...

Thanks,
Stephen.