I anodized my Graftons. ...sort of.
There is a bit of bother about those bushes. If you take the bushing out, and anodize the arm, when they strip it and electropolish it, it removes some thickness of metal off the surface, and how much depends on how long they leave it in, and how long they leave it in is entirely up to a multitude of factors. So afterward, when they anodize it again, and grow the oxide layer, that thickness isn't exactly the same. Plus, there'll be some wear in pushing them back in again... So there's a chance your bushings will be loose. If you leave the bushing in, it'll etch away at your brass and open up the ID of the bushing, which will then fit loose on the stud.
so I cheated and just anodized the L brackets, spring covers, & face plates (which actually came off another mismatched set anyway) to match the rest of the bike, avoiding any trouble with the bushings at all.
plz excuse the badly lit basement-at-night pic
But I have ano'd a few things with stainless steel inserts (bonded bolts & rivets) in them, to no negative effect.