Funny as I too thought the E89 much much wider, but there's only 0.4" in difference
E85 / E86
Length
4,090 mm (161.0 in)
Width
1,780 mm (70.1 in)
Height
1,300 mm (51.2 in) (roadster)
1,285 mm (50.6 in) (coupe) - probably why the coupe has a different sized windscreen
E89
Length
4,239 mm (166.9 in)
Width
1,790 mm (70.5 in)
Height
1,291 mm (50.8 in)