I ordered 2 new LRA blue springs from Graeme Cooper. When they arrived they were 16.5 inches free length instead of the correct 15.5 inches free length.
Andrew from LRA is discussing with the spring manufacturer what went wrong. Watch this space.
I ordered the "blue " springs because I do not want it quite as high as the rear OEM green springs would make it (2" ). These blues are 1/2 inch longer than the greens, so it would be 21/2" and no castor.
Regards Philip A