If you have the SPM.mat and the relevant contrast already created you can use spm_uc to get the threshold, I believe.
u = spm_uc(0.05, [SPM.xCon(iCon).eidf SPM.xX.erdf], SPM.xCon(iCon).STAT, SPM.xVol.R, n, SPM.xVol.S)
where iCon is the contrast number and n is 1, assuming you're not looking at a conjunction. I don't know how you would find the height threshold for a conjunction.
Best,
Taylor
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