I dont know if this is the one your looking for but I found this on fleabay it looks like the oem one i have in the my X5 RSE
BMW OEM DVD Player PU-2595A - eBay (item 140503739669 end time Feb-20-11 12:27:49 PST) in mine its mounted between the rear seats to match the interior.
and it mounted vertically this says indash but it looks exactly the same to me. I see the same din plug and power harness wires

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E53 06 3.0i

wishlist
Comfort Seats
speckdock 2.5

Mods
Air suspension - wip
skid plate replica - in box
OEM sunroof deflector
OEM bluetooth streaming
navi,dsp,tv retrofit - wip
Low prof roof racks
2 directtv satelite tuners
Grom audio usb2
quarter and back window sunshades
2 10"subs- boxes opposite sides/Alp MRP-M850
rear heated seats retrofit
rear footwell lights retrofit
remote window roll up