Thanks Joe, but I see I can easily buy them off of Ebay US and they'll ship them to here. But I need to go and see our local Wurth shop, they seem to be the ones that sell them over here, maybe they can get hold of the UNF sets. It will save me a lot in import charges if they can.
Valerio, no bother at all, your own experiences can only help to make my car better. Getting the M8 parts here isn't that difficult, but I would like to keep the original 5/16 size. No reason other than me being stubborn and not wanting to mix imperial and metric bolts everywhere.
Serge