Here is a node setup for a simple anamorphic glare. If you want use this setup in you're own files, go to file>append. From there, find the .blend file, click on it and you will see a file called "node tree". Inside is the node group. Select it and then click "Link/Append from Library". Then go to the node editor and hit "shift a" > "add group", and there should be a group labeled "Anamorphic Glare". You should be able to do the rest. Any questions, contact me via email (email@example.com). Good luck with this file!