38999 contacts for pcb through-hole pass through connectors
The contacts are actually Pin Receptacle Connector 0.025" ~ 0.037" (0.64mm ~ 0.94mm) Standard Tail Solder and made by mill-max for anyone who stumbles across this. The idea is to solder the ones with tails and then connector pin receptacle contacts mate with them to create a pass-through that can T off to some other circuitry.