The WRC build manual aint much use for the saph and sierra race cars....909 part numbers started back in the mk2 esc days and extend through sierra, sapphire and esc cos....there are other volumes of both sierra, saph and esc cos grp'n', 'a' and wrc available....even then some of the parts have different levels...I have a copy of the grp'a' saph homologation papers that details better the development of the 4 x 4 saph and the different setups used on gravel & tar.....trouble is its only a hard copy

All the boreham work is documented, a lot of what the other teams did (RED, MTD, MLP, Spooner, DOME, MSPORT) is less well documented.

If I can help wih something in particular on the 4 x 4 saph and esc cos/wrc let me know....

Ian