So will you use this rusty E53 as a donor for the 6-speed swap into the other unicorn X5 ?

If so, I don't understand the drama associated with parting the rest of it out...That should have been part of the plan to begin with..

If you are not swapping the 6-speed trans, it obviously has value with pedals, driveshaft, shifter, harness, etc. as a swap kit...

As for other X5 parts...the following have value and are worth removing in my opinion.

-The B30 engine
-battery if good
-headlights if xenon and not foggy
-tow hitch, harness and tow module if equipped...Get the hitch sandblasted.
-side mirrors if good
-Driver and passenger side door handles and handle carrier if Genuine BMW
-interior door and dash trim if unusual and not cracked.
-Does it have the rolling rear floor
-Maybe the Alpine Amp in the driver's side rear cubby
-Auto-dim rear view mirror if equipped.
-HVAC panel and buttons.
-ignition switch if Genuine BMW
-Alternator....rebuilt Bosch units are junk IMO

__________________
'99 E39 528i 5-speed 130k
'06 325Cic auto 115k
'05 X5 3.0 auto 173k-SOLD
'03 530i - manual swapped - 430k miles - Parting