It's a relatively minor aesthetic change. The surround and clear selector window on mine were scratched, so I thought I'd take a bit of a leap and fit some Ghia replacements. The parts cost me about $113 from Bayford, but if your selector window is fine then you can reuse it (-$20)
Now I just have to decide whether it's worth another $190+ to replace the t-bar with a leather+chrome Ghia version...