Dear Joelle,
I haven't tested Christopher's script, but from the description it seems to allow to specify a certain alpha on cluster level, e.g. .05, .01, .001, and to obtain the corresponding extent threshold in voxel units. Note that within SPM, the cluster information (those values stated at the bottom of the results table) always refer to .05. So it should be the same, just an extension to other alphas.
Best
Helmut
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