Hello cbarnes,
The Sullins connector SFH213-PPPC-D20-ID-BK is meant to be used with a shrouded header, for example SBH11-PBPC-D20-ST-BK. However, the S2212E-20-ND (Sullins PEC20DFAN) has the same pitch and row spacing as the shrouded header, so it would still mate to the female idc connector.
S9314-ND(SFH213-PPPC-D20-ID-BK)
S9175-ND(SBH11-PBPC-D20-ST-BK)
We do have 40 position 0.100"(2.54mm) pitch rectangular cable assemblies here, Cable Assemblies | Rectangular Cable Assemblies | DigiKey if a pre-made cable option would be more suitable to the application.
Otherwise, to terminate the ribbon cable to the IDC connector S9314-ND. Please see the post’s below.