It's a very common problem, haven't heard of them being refurbished though, you can put mk3 or 4 rear calipers on as a direct replacement. Fairly pricey from VW dealers but.....
http://www.bildon.com/catalog/Detail...=4&SubNav=none
They crap on about these being "super special light weight" when they are infact mk4 stardard rear calipers.
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