I think I found a nice one on eBay I’m going to get just need to look into the fitment. I have been having a hard time finding them. I figured like yourself, people change them and would have tons laying around.
I have 3 , 2 that the membrane has white paint over spray. The other is cleaner but the membrane doesn't flex as the other ones.
TMI i know, we can discuss price if you can consider one of these.
Thanks Austin Kendall N2BUICK