This might be more trouble that what it's worth for you, but maybe try comparing BMW specific part numbers between the 4.4, 4.6 and 4.8 on www.realoem.com. If the part numbers are the same, or the dealership can confirm that they're the same, then you can just order from a similar yeared 540/740 w/ the 4.4.
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650hp 10 X5///M - Stage 2, Vibrant 1794's , gutted cats, custom intake, AC Forged 22's 325hp 98 BMW 740iL - ///M5 6spd, www.bavengine.com w/ Performance Option, electric fan, CF intake tube w/ heatshield, Mag 14816 w/ notched bumper, Bilstein/H&R Stage II/Powerflex 600+hp 02 Harley F150 - MHP900 Stage 3 engine, KB2.3, 8# lower, 60# inj, Walbro FP's
135hp 01 TL1000R - M4 full exhaust, K&N, Yosh box, -1/+2 gears, 2CT's
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