A system is disclosed which features precision alignment of receptacles having depending terminals thereon within headers adapted to receive integrated circuit components thereon. The individual header is made of a suitable insulating material and has a plurality of apertures therein, each of which has two intersecting surfaces precisely located relative to a master reference point. The receptacles have plural spring means thereon which bias the receptacle into the corner defined by the intersecting surfaces. The receptacles also have spring contact fingers at the end opposite the depending terminal for receiving posts or leads form an integrated circuit component. The header has located thereon plural latching features for positively retaining thereon an integrated circuit component.