Don't know of any left in SC; Metal Platers in West Columbia used to do car parts, but no longer. Closest I know of are as follows:
For bumpers, Tri-City Plating, Elizabethton, TN (800) 251-7536:
http://www.tricityplating.com/
For small parts, Graves Plating, Florence, AL (256) 764-9487:
http://www.gravesplating.com/
Hope this helps.