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Hmm... I think you should do some asking at the big turbo boys, over here in the Netherlands we have Hoet,
http://www.turbos-hoet.be/hoeteng/
This is the international Hoet site, htey are over Germany, France, Belgium and the Netherlands.
The original on the Crystal is a Holset 3LD-12, i dont know which one Ursus fitted. These Hoet guys are the boys that fit or rebuild any turbo. ask them, they can fit any turbo.