There is standard plating (the cheap way) where the part is stripped (old chrome removed chemically) then ground to remove (as best as they can) surface issues (pits, outgassing holes, etc) and plated, 1 pass through the electroplate tanks. The better way is stripping the chrome, the grind operation, then copper strike. After copper strike, it goes back under the wheel. When the friction warms the part up, the copper gets soft and can be moved around a bit in an effort to fill any remaining holes. After that the part goes through electroplating. Check prices and only 1 pass through electroplating in chrome which needs to be Hexvalent ("Hex") Chrome which is the brightest for outdoor uses (door handles, bumpers, etc).
Price the work first then check on eBay or club vendor sources to see if you can buy a good NOS piece first at the same or lower price.