Side frame rails


I'm deciding the best way to repair the rotted out side frame rails on my 97 ezgo limo. Not the main boxed rails but the ones that go along the out side of the chassis and the rocker panels attach to them. I'm thinking the best way to repair it is to cut the old welds and remove the rotted frame rails and replace them with new ones. Is there any way I can buy reproduction ones from EZGO? I'll post pictures of the damage, maybe there is another way to fix it if those frame rails are to hard to come by.