archs
You can put steel arch on but you will have to remove and take care of hole that were there,this means fiberglass work or plugs that might not be as nice looking,you will have to work something out for the lines that work off your arch now onto the new one. the cost of all this plus the cost of the new arch would get expensive, but with enough money almost anything could be done. You might want to check into a custom built arch it could be the best way to go in the long run,considering that you are overseas and that means additionl cost to ship etc.