the mufflers that I want to buy Have stamped on them 64900111 and 64900112 and also have HARFLT1800. I can't look at mine right now cause its still at the dealer. (it had a very small oil leak) which I thought was the drain plug gasket. it would drop a quarter size spot on the floor every once and a while maby be 2 times a week. I dropped it off before vacation for its 5,000 mile service. bought over 600$ is accesories before i left. they called me when I was down in Hilton Head and tell me that the oil leak is between the engine and trans. I am like ok. Is it under warranty? They said yes. they would get it in one wed. for the repairs cause it would take them most of the day to do it. which i under stand cause the engine most likely needs to come out. I explaind to them that I have leds on the bottom of the tank and on the back side of the horn and air filter housing. they are plugged in under the seat very easy to get to and remove I marked them. That was on the 9th of July. I spoke with them today and they haven't even touched it yet and are waiting on harley to call them. The service writer that I have been talking to up till today is gone for the week. And this guy has no clue what is going on. He is suppose to check and call me back. If they found something else just let me know. I am not a butt head. Just want my bike. I know I didn't buy the bike from them but I sure buy all the little goodies from them and have my service work done there. I have my own lift and can do the service my self. Just want to build a relationship with them. I would have bought it from them if they would have had one. but back to the mufflers I think they will fit. But not sure.