I've got a 82' CB650 and I bought what I thought was a replacement gas tank. But I think it came off an SC or nighthawk. I made it fit by adding extra steel washers to the two posts off of the frame near the front and had to bend down two tabs on the bottom of the tank near the rear. Other than that it fits ok, just doesn't quite look stock. I you find a good regular CB one maybe I'll swap you. So based on this, you can probably use a regular CB tank.