ROC Specify Cut - Offs


I am conducting a couple of ROC's to compare our sample with the results from other analyses and am a little stuck

Basically other papers have looked at specific cut offs (e.g 50) however whenever I run the analysis in SPSS my cut offs are all varied, for example 50.5, or 48.5, which I know is really really close but still, is there any way to compute the specific cut off?

I also have access to STATA so can use that but again have absolutely no idea how.

Thanks heaps :D