Thanks X5only. It looks very nice.
I just found this thread but the pictures are missing. It looks like the e70 rear wiper fits the e53 withou mods.
E70 Rear Wiper Fitted to my E53!
If the e70 fits I might not need to cut the volvo arm to fit it properly.

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4.8is 2004 imola red
4.8is 2005 Black on Black - DINAN/2 sold
4.4 2004 X5
2003 330xi
2008 328xi - sold
4.4 2000 X5 - sold