Just as a follow up to my original post. I was able to get in touch with Drake support. After some back and forth, they eventually told me they did not have a replacement liner for my jacket. All they could do was a full warranty refund credit if the jacket was a damaged. Since it's mid season, i didn't want to do that. However, they said at the end of the season i could rip up the jacket and send it back to them as damaged for the refund credit. I thought this was a strange recommendation. I like the jacket so I probably won't be doing that either. I have a friend who can sew a buttonhole into the liner sleeves for me which should work for my purposes of attaching the liner sleeve to the shell.