Handle replacements

I have a broken handle on a FAMA storm door lockset. Your 40-101 handle pair is almost an exact replacement. Based on your pictures and dimensions, the only variation in dimensions that concern me is the diameter of the round handle shoulder where the square shaft is inserted into the interior handle. Is that measurement really 11/16 or is the overall diameter of the handle barrel 11/16? My FAMA measures 11/16 diameter overall but the shoulder near the square hole is only 9/16 diameter. Thanks!