If your Old Midas originally had a generator but it is missing or not working, you would need to find the same model in a salvage yard or deal with a lot of renovation to make a new one fit & work. And the cost is likely to be thousands of dollars. You probably don't need one anyway, as Rene already explained. If you do want generator capability, the most cost effective solution would be to buy a small portable type, e.g. a Honda or Yamaha "suitcase style" genset and just tote it out when needed. Not practical for use as you drive, but fine after you arrive.