Ross
The air con compressor is the same set up fitted under the bonnet as my RS. This is not factory as they mount the compressor on the distributer side, thus moving the battery to the boot. From my own experience the compressor you are chasing is available, however you can not get the recharging points on the back of the compressor any longer, so I had recharge points fitted to the hoses.
The compressor position was fine until I fitted extractors and they fowled on the alternator, so I needed to redesign the bracket with the alternator sitting lower, this however meant the compressor need to sit lower, and in the end the bottom radiator hose goes in-between the hose.