Convex door mirrors are a must. But if your central wind screen mirror is flat, change that to a convex one too. It made a huge difference, more substantial than the door mirror change - at least on the passenger side. The mirror comes in two sizes, the smaller one will do. The headrests limit the rear wiew anyway, so the larger one does not give much of an advantage.
Robbie, I am interested in a better view from the interior mirror, would you have a link to supplier on this?