General Motors Co. (NYSE:GM) has tapped Spencer Stuart, a recruiting firm to help pin down a replacement for ex-CEO Fritz Henderson. Even though the search might take a year, there's no lack of speculation over candidates that might fit the bill to lead GM. Randolph Gulian, executive vice presidentgeneral manager for recruitment process outsourcing and executive search for Allegis RPO, jumps in with some unexpected picks, including Hewlett-Packard Co.'s (NYSE:HPQ) Mark Hurd and General Electric Co.'s (NYSE:GE) John Rice.