Mack713

Hello, I have a 99 CL 713 Mack triaxle double frame that is starting to show its age with rust between the frame rails and don't want to get rid of the truck so I would like to replace the frame by getting another one to completely strip down and build back new. I know there is a company that can make new straight rails however I would prefer to now cut my frame. Is there anyone here that knows someone with old frames laying around or what frame models match up with a 99 CL713