Here is a wonderful site of Denso Germany with
Bestell-Nr.= order number
Kompressor = compressor
Typ = type
Füllung = filling volume
OE-Nummer = OEM part number (BMW)
(nur zum Vergleich = for comparison only)

click on Cross Referenz
Liste
select BMW

Also interesting: Anleitung zum Wechseln der Schaftdichtung

instructions to replace the seal at the shaft
http://www.densoklima.de/frameset.htm