https://thebmwminipartstore.com/part...subcat3=136509
Found this website and it looks like they do sell the side covers for the convertible still. Just bought some through Ebay and they were expensive. I saw the chatter about 3D printing them and I had looked into that with a friend in the auto industry in Detroit. The cost was prohibitive and they couldn't guarantee the quality/durability, so I passed.