Lee, wet and dry the affected 'rash' areas to a smooth finish. You will have to remove the lever rivet as that cannot be anodised but you need to fit the body rivet before anodising.
There is no need to strip the original anodising either as they will do that prior to re-doing in your choice of colour
A little bit of advice though, if you are taking the levers or posting them to the anodisers, send along another item in original gold finish to colour match to. Let them know you are sending item if you are posting to them to colour match though okay