They are apparently the 4 pot rear calipers from a Porsche Cayenne 2010 onwards or a VW Touareg 2011 onwards but after a search on google I can find little more about them. According to the ebay ad they have covered very little mileage and to be fair they do look near brand new (apart one of them having a little scrap near the mounting point). They suit 28mm thick discs and come with a set of pads with plenty of life left in them.
Thought I would pop them on here first to see if anyone was interested before they go back on ebay. More pictures can be found here. Any questions just ask and I will try my best to answer.
Radial mounted
mounting hole centre distance is 130mm
they weigh about 4kg each with pads
£200 delivered
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306 2.1 S16 Tarmac Rally CarProject thread: http://www.306gti6.com/forum/showthread.php?id=143956