You can buy the side mouldings painted for 06+ models from places such as thesaabsite. Unfortunately the newer models do not have front or rear bumper mouldings, so you have to do that yourself. You can also buy the painted door handles for 06+ models and swap them, at least according to the parts guy at my local dealer. I have only been able to find one part number that correlates between both sets of model years, so I'm not 100% on whether it is possible or not as there are 3 different part numbers for door handles.
PN's:
12756110
12756111
12756112
12756113
12756114
12756115
I have also color-matched all the mouldings on my black Aero, and the difference is astonishing. For those who don't have the time/money/resources to do so, some Forever Black every few months will at least keep the plastic looking a deep, glossy black.