the compressor was developed by TTE, they then provided TMG(toyota motorsports germany) with some kits,which they sold to TDI,so to answer your question,there is no other place in europ to buy a compressor other than through the official outlets of TTE, or the supplied outlet of TDI
i would for peace of mind get it done at TTE,I DID AND IVE HAD ASOLUTLY NO PROBLEMS!!!!!