The 5176837-8: That footprint mates with any 2.00 mm pitch IDC socket or crimp receptacle from the AMPMODU family, so the mating half is a standard catalogue item, not a custom.
Current, Plating, and Contact Duty
Mounting and Board Orientation
The 0.102" (2.60 mm) post length is sufficient for a standard 1.6 mm board thickness with a through-hole solder joint; the 0.165" (4.20 mm) insulation height clears most SMT components on the opposite side.
Cross-Reference: 5176837-8 vs 5176837-9
The 5176837-8 carries 18 positions; the 5176837-9 carries 20 positions. Both are dual-row, 2.00 mm pitch, unshrouded, right-angle headers from the same AMPMODU series.