You could get the anti roll bars galvanised, I guess, but I'm not sure if they suffer that much from corrosion. You could possibly also do the wishbones, but the galv might interfere with the mounting bushes, as it will add noticeable depth to the metal and reduce effective diameters/hole sizes.
I've been advised by people who know about this kind of thing that, aside from galv, the most effective form of anti-rust finish is obtained by using two coats of epoxy 2-pack primer followed by 2K top coat paint. But 2K must be applied by an operator using full air-fed mask and appropriate PPE, as the stuff is hazardous to health. Certainly not DIY territory. The epoxy primer can be rollered, brushed or sprayed on and is essentially benign, but 2K paint contains isocyanates.
