looking to change some things on bike

does anyone make a polished rear axle cover for the F? The only cover I can find is from HD and it only comes in black.
I'm also looking into changing the front springs and rear shocks.has anyone used the progressive front drop in lowering springs? How Do you like them? If you used them what rear shocks did you go with ?
I got the mod bug and I just started with grips and pegs.