Well here is a quick update, I went to court the Friday before last and won my licence suspension appeal. However about a week prior I got a flat tyre, then while taking the wheel off I noticed that at least 2 of the nuts were loose, one of which I undid completely by hand!! Very worrying, very very worrying, just glad it didn't come off while I was driving!! Anyway the other 3 nuts were very very tight and took quite some getting off, but while I was fitting the space saver (the ugliest thing ever invented) I sheered one of the bolts straight off. I am fairly certain it was the one that had the loose nut to begin with. I was absolutely baffled by this, but it was suggested to me that perhaps the loose nut caused the wheel to slam slightly back and forth on the bolt which may have cracked it, causing it to sheer (evidence to support this is that the bolt sheered off under very very little pressure! I barely had the nut done up at all and it came clean off!). Anyway, all I really wanted to knwo is where (i.e. Repco) to get replacement stud bolts and what I am asking for (i.e. part no.), might be time to do all of them. Thanks guys!
Had a similar thing happen to me once, when i went to find new studs no where had them the correct length except nissan.
Studs are available through Nissan dealers, should be about $5 each. Rear studs are different to front studs so make sure you get the right ones. Most mechanics should be able to fix pretty cheaply.