phoned up the local motorfactors and they sed the only ones listed for my car are 58+vat each for the arms and the calipers are 147+ vat each for referbed ones an i have to return the others as exchange, this one looks right
http://www.ebay.co.uk/itm/AUDI-A8-RI...#ht_1150wt_846
yes hand brake is partly working on the driver side and not at all on passenger side and its also binding passenger side as if the break is stuck on slightly,
the two arms gone are both the same passenger side lower front facing arm/joint
and the driver side lower front facing
is that what you have spare ?