1. Contact the store you got the cooler from and see if they can do anything(Maybe you can just send back the mounting bracket and get the 1150 one.). Worst case they may request you to return and swap it.
2. Contact Noctua (support@noctua.at) and see if they can get you the part you need. I know many of the adapter they have are free to get older coolers working on newer hardware, maybe they can do the same to allow the 2011 version to work with 1155/1156/1150.
Even if the adapter cost something it may be worth it for the PWM fans the 2011 version of the cooler has.
1. Contact the store you got the cooler from and see if they can do anything(Maybe you can just send back the mounting bracket and get the 1150 one.). Worst case they may request you to return and swap it.
2. Contact Noctua (support@noctua.at) and see if they can get you the part you need. I know many of the adapter they have are free to get older coolers working on newer hardware, maybe they can do the same to allow the 2011 version to work with 1155/1156/1150.
Even if the adapter cost something it may be worth it for the PWM fans the 2011 version of the cooler has.
It's okay now. For $7.50 I got the whole mounting kit on amazon. Since Noctua gave those kits away for free to people with older boards, many must have sold them off, and that's why I found it so cheap (imo).