HELP! We can't find a core for my Pass. Side head

[Lexicon740iL]

I really need your help on this one guys.....

As you may remember I had catastrophic engine failure in August. A rocker lever ejected through my passenger side cylinder head leaving a sizable hole in my cylinder head.

http://www.xoutpost.com/bmw-sav-foru...il-ground.html

The engine is pulled and heads came off last weekend. I was so excited I finally have casting numbers and can get them sent out for re manufacturing. So I can get me baby back on the road for the MN winter.

The only problem is.....We can't find a core for the pass side that has the hole....

Car-part.com has several listed but all pulls are from 04-05 when I search for an 06 and the ones listed that do denote casting # are not the one I need.

The shop that I'm using for the head work can't find me a core...

The casting number from the passenger head is 751294311 0315346

HELP!

I'm very frustrated at the thought of having to replace the whole engine just because I can't find a pass. side head so I can get mine redone.

I would much rather have remaned heads with new seals than put a junk yard pull in mine thats just going to have smoke on start up because it has bad valve seals when I am so close to remedying this common issue W/ N62's while I have the darn heads off.

What can you guys tell me or recommend for me in this situation?

Will a head from a 04 or 05 N62 work even if it has a different casting number on it?

What are the differences and nuances of the 06 4.4l N62 ? VS other N62 e53's Engine wise?

My production month is May 06 and the last 7 of my VIN are LV27226

Price is an issue right now unfortunately as I'm currently engaged with the date fast approaching.

Any help advice or leads are much appreciated guys.

TIA
-Alex