Depending on the quality you want you may be able to find someone locally, but if not here is one of the best in the US. Custom Chrome, Grafton Ohio. I can tell you they are not cheep. If you go online there are many good places . Also check with any custom Motorcycle shop, they will probably have someone local
In my not so distant past I restored Austin Healey's and had a lot of expensive , hard to replace parts chromed. The plating part is easy, its the prep and the buffing that make the difference. A bad prep can screw up a part fast. It will also alter the fits of a part. There is usually a layer of copper under the chrome. Thicker chrome is not better chrome.
Hope this helps.
One last thought. there are some great chrome looking powder coats out now that look great.