For minis with latest A plus water pump pulley
CAM6408 (4.75" wide) and an alternator. This belt is slightly shorter than
GCB10838 so always keep a spare so you know which size belt fitted your car best. This seemed to be fitted to most cars from 1980-1996.
1275cc from 1990 also used this belt with the large pulley.
CAM6239 pulley 3.875" wide and
CAM6408 pulley used from A plus onwards is 4.75"wide.