Here is a sample of the orange gaskets and replacement blanking plugs for the inlet manifold:
http://www.ebay.co.uk/itm/BMW-swirl-...item1c4c31ab9e
Be aware the often 2 sizes of swirl flap blanking plates are quoted for e90 330d... you need to check what size you need... (mine looked like larger of the 2 sizes but as I say I didnt go for replacement yet)
I am by no means advocating buying parts off ebay! get BMW original if you can, as always, buyer beware ;-). Pics give you an idea what to look for though...
the swirl flap replacement may be a pain in the ass... but by the time you get the inlet manifold off you will have toughened up so it will seem like a walk in the park :-D
Let us know how you get on with it :-)
Phil