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@1_n
http://sheldonbrown.com/cribsheet-spacing.html
From this sheet I calculated the 7 spacers need to be 3.27mm plus 1.3mm single spacer on the inside. This assumes total width is 38.2 for 9 speed. (1.75 sprocket x 8) + (3.27 spacer x 7) + 1.3 inner spacer = 38.19.
8 speed total spacing is 36.9, 9 speed total spacing is 38.2 hence 1.3 inner spacer.