Before I buy the necessary items does anyone know EXACTLY what parts we'll be needing?

My shopping list (so far) looks like this:

#2 (1 set), #6 (1 set), #11 (16 off), #13 (6 off). I already have #8 (2 off) from another time, for a different reason.

Do I need #15 (4 off)? Or is there anything else I have missed?

RealOEM.com * BMW E53 X5 4.4i Cylinder head cover

The reason I ask is because not only is my stealer an hour round-trip (don't want to have to do the journey more than once for the same job!), but because these are not stocked items. Apparently they are 'special order' items meaning that if I order something I don't need they will not refund me!

Thanks guys.