ICASEA benefit for Japan

http://icasea.bandcamp.com/album/benefit-compilation-for-japan

"Benefit Compilation For Japan" is dedicated to the victims and survivors of the March 11th Tōhoku earthquake and tsunami, and to those affected by the ongoing nuclear crisis.

All proceeds from the sale of this compilation will be donated to assist in the rebuilding of peoples lives and the recovery of the devastated areas. The proceeds will be split between the Japanese Red Cross Earthquake Relief Fund and the special accounts set up by the regional governments of the affected areas for the acceptance of monetary donations."

Mogwai's contribution is 'Mexican GP edit', which is presumably the same recording mentioned here.
It can be bought as a single track here:
http://icasea.bandcamp.com/track/mexican-gp-edit