[Big hammer]

My 2009 LB came with instructions that said if you need to trim the new panels pull the cover off/back and then trim, reinstall the cover. If your old panels fit well then try your new panels and then trim them to fit. My helper was watching me and asked me why I removing what I just installed? That's the process! I told mom it's like measure twice cut once. Good luck, take your time and enjoy!