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Yes, that my work of art. (kouch)
And yes it should fit, the M950/M952 cranks are practically the same, only the pedal ends on the cranks (I heard) are a bit wider on the M952.
It's mostly the design in chainrings which changed. If you can find a separate 4-arm spider it should fit the same crank.
Yes as far as I know all 50 series are the same.
I have a XTR DH ring, but it's a ring without a spider, so I guess the also offer a 4-arm spider, without the ring. I have only seen 5-arm spiders (without rings)