A retention member aligns and stabilizes one or more insert molded lead assemblies (IMLAs) in an electrical connector. The retention member provides for alignment and stability in the x-, y-, and z-directions. Such a retention member may be in connection with a right angle header connector. The retention member provides stability by maintaining the true positioning of the terminal ends of the contacts. The retention member is expandable in length, and may be sized and shaped to fit a single header assembly or multiple position configurations.