This is sort of dead, but just wanted to post this info for the next person. I looked up the Denso part numbers for the pre-facelift 4.4L , and this is what their website says.

Type 10S are Reciprocating, Dual Swash Plate, fixed displacement
Fits pre-facelift 4.4L E53 X5
Denso Part Number 471-1380
Type 10S17C

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles