Bo hires ex-head coachANN ARBOR, Mich. (AP) -Michigan football coach Bo Schem-bechler has reached into his old conference to pull out an assistant to complete his staff.Michigan named Don Nehlen, former head coach at Bowling Green State of the Mid-American Conference, to replace departed backfield coach Chuck Stobart on Tuesday.Schembechler, former head coach at Miami of the MAC, was once an assistant at Bowling Green when ■ Nehlen quarterbacked the team to a 21-2-4 record over three years.Nehlen, 41, resigned the Bowling Green coaching job after last season's squad posted a 6-5 record. His overallmark in nine years at the Ohio school was 53-354.Stobart left the Big Ten after Michigan’s Rose Bowl loss Jan. 1 to Southern Cal. He is now head coach at Toledo of the MAC.Gary Moeller, Michigan’s defensive coordinator, also left the Wolverines after the Rose Bowl and assumed the head job at Illinois.Nehlen’s Bowling Green teams were noted for pulling upsets. Among them was a 17-14 triumph over Purdue in1972, a 41-14 trouncing of Syracuse in1973, a tie with San Diego in 1974 and a victory over Brigham Young in 1975.He coached at South and McKinley high schools in Canton, Ohio.