MB was paying to have the subframe replaced if it was the older style frame without the reinforcement gussets. Only if there was already a crack though. If there was no crack, they would have the gussets welded in for you only. Your probably out of luck if the car came with gussets from the factory and it cracked anyways. I replaced a subframe just last year at no charge to the owner on a '77. One lower control arm mounting plate had cracked right off, of course the recall had not been done back in 84 when it should have though, but MB covered it anyways.