[Aussie Mike]

You should also be careful with anything like anodizing or chroming on suspension parts like this. for example chroming on steel can cause hydrogen embritelment making the part weaker. I'm not sure what effect the process may have on aluminum.

Anodizing will harden the surface and protect against corrosion which is probably a good thing but you would have to wonder if it will affect the heat treating of a part like that. Also some castings don't take anodizing well so you may get an inconsistent finish. Hard anodizing may give a slightly yellow color to the aluminium too.

What ever process you do check with the guy doing it and explain what the part is for and find out how it may be affected.

Cheers