Looking for track frame (car body) for Link-Belt LS2800C 11 or Case 2030 both are made by Sumitomo
That's an old machine model. Not that many sold in the days they were new. I used to see that kind of stuff on burned up machines. Best bet is Insurance Auto Auctions or Copart. They are liquidators for insurance companies and handle total loss salvage. Even that will be a long shot.