United Auto Workers employed by Delphi Automotive Systems following its May 28 spinoff from General Motors will have the same investment options and plan design until Nov. 1, or the first day following expiration of any extension of the union contract, according to a letter to the union from Gary L. Cowger, vice president of GM labor relations. Moreover, account balances of 401(k) participants who are union members will not be transferred to the Delphi plan until the union and Delphi agree to do so. Until then, only new contributions will go into the Delphi 401(k) plan, Mr. Cowger wrote. "These new contributions will be invested in the same investment options that participants elected under the GM plan, unless participants elect to change the options, he wrote. The letter also indicates the transfer of pension plan assets and liabilities does not jeopardize the unions right to contest it during upcoming negotiations.