Right, got them today. While they are lovely, I am convinced that they are for road bikes. The rods on both are about 4-5mm mm shorter than my hope ones and with the inner caps having quite heavy countersinking for the springs, on the rear of my Voodoo, only about 3mm of thread makes contact. They don't feel sturdy enough to keep on to me.
The front gets a little more thread contact with the RC31's but still not enough for me to consider keeping on. The rod width also seems thinner visually to me but I didn't check it with a guage. I am not going to bother trying them on the Ravens. Shame as they are very nice and came in at 42 grams on the scales but c'est la vie!