My BB and TRF201XR are still coming...
About your question (and helped by stellamodels web):
1-The #54506 Big Bore Aeration Damper Front Spring Set (4WD) item have these colours:
Soft (red), Medium (yellow) and Hard (blue)
2-Item #54507 Big Bore Aeration Damper Front Spring Set (2WD):
Soft (white), Medium (no color) and Hard (green)
3-Item #54508 Big Bore Aeration Damper Rear Spring Set (for both 4WD and 2WD):
Soft (red), Medium (yellow) and Hard (blue)
Tamiya Spring Ratings:
http://freepages.family.rootsweb.anc...ars/spring.htm
I hope Lee Martin will share the setups used in Euros 2013.
Best regards