Fitted to N52 2.3i.
No idea if they are OEM or not but the manufacture quality is top notch. They have not got blue heads which the really should have but I used an indelible blue marker on the which helped me keep track of where I was whilst tightening them down. A dot for torqued and filled in for angled. So no blue heads was useful..! :D
In the picture OEM is on the left. Bear in mind they are used!