It was a Ford authorised upgrade in Scandinavia (255mm). There's a full TSB on the TIS.

Minor point .Ross, the stone guard is different on the ST170 as well.

I've not noticed anyone mentioning the multiplicity of hoses and pipe arrangements. As Fords TSB, I've found the best is the after 2002 2.0l hose (long). Its even cheaper from Ford than a factors.

Martin