Are you aware of this thread? I think your pics are of the 99000-79N12-007 but at this point you ought to also be satisfied with the 99000-79N12-021. It used to be possible to find one or two for sale if you searched. But I just tried and the hits that I got all said out of stock. It's a neat muffler but the racers didn't use it because of the exhaust valve and catalyst. The cost meant that few street riders bought it. So it's a rare bird.