Current Tamiya Spring ratings in lb's (thanks to Linger)
Milky blue White (Extra Hard) = 17.1
Milky Blue Blue (Hard) = 14.9
Milky Blue Yellow = 13.1
Milky Blue Red = 11.53
This would be the same for the white coloured set too.
Now for the standard coloured set, I'm not too sure if the whites (extra hard) are the same... as Ling noticed there was a reduced coil count on the the milky blue (and white coloured) springs over his original testing of the whites. This increases the stiffness from 15.3 to the 17.1 noted above.
The other springs in all three sets should be similar however, it's just the whites that seem to have changed
As for the shorts... ignore them, they are really for the mini's
HiH
Ed