Board Fit and Contact Interface
The 4-103747-0-15: This is a 15-position single-row unshrouded header from the AMPMODU Mod II series. The square male pins (0.025" square typical for this series) mate with standard AMPMODU Mod II crimp-socket receptacles or IDC connectors.
Comparing to a Shrouded Sibling
The closest functional alternative in the same brand is the 1-1871673-2, a 4-position shrouded header with board lock and detent lock. That part trades position count and pitch (4 positions, 0.098" pitch) for mechanical retention and a right-angle mount. If your board needs vibration-proof mating and a board lock for reflow, the 1-1871673-2 is a better fit—but you lose 11 positions and gain a different footprint.