How serious are you about this?? My brother is very into his rallying and has a few friends working in prodrive if its a serious enquiry I can get you contact details but prices can be fairly high, prodrive also do an annual sale and make the catalogue publically available of stock selling off.
I asked before about spares and a lot of the classic stuff is long gone but they still have some stock. Try some of the Rally prep lads in Ireland first Mc Kinstrys, DMR, Harper etc have you put ad's on rally.ie
Bevan