I had the tracks at one point on my 360, but lost them due to DRM issues after a RROD.
The only way to purchase them is with a credit card. Microsoft points will not work for original Xbox content.
Edit: You will also need a Gold account to do this, Silvers cannot "sign-in" on PGR 2.
Order some golf shoes, otherwise we'll never get out of this place alive.
Impossible to walk in this muck. No footing at all