I wish I had an answer to your question but I don't.
A suggestion would be to check locally to see it you can buff out the ones you have and then have them replated.
Powder coating would be another option.
On the same subject.
I have posted this before but since the title of the post is rifle clips let me add this sleeper deal.
I don't care for the clips sold by PSI,The detail is not all that great.
Giving credit where credit is due, the ones supplied by CSUSA are much nicer but individual cost is $1.75 each.
Here's where the deal comes in.
In their catolog they have a "design" your own pen with a selection of different clips.
The same rifle clip that is sold separately for $1.75 is included in a complete kit for $2.12 in lots of 10.
The detail on their clip is more accurate and the lever action rife looks nicer than the PSI clip which looks like the trigger guard is a magazine.
The down side of CSUSA is their shipping cost but perhaps they will soon realize that handling charges are looked upon by some as "gouging" and make appropriate changes.
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