Changing glow plugs on N57?

I've had a glow plug fault ever since I bought by 2009 330d. I replaced the control unit with a second hand item from eBay but the error remained along with the rough idle so I'm now going to replace all 6 glow plugs and fit a brand new control unit.



ECP states that these are the glow plugs for my car and the product code differs to the M57; has anyone bought these?

http://www.e90post.com/forums/showthread.php?t=794938



Are there any guides to removing the manifold?