I purchased a hardtop for my Z4M Roadster, but the side caps and windshield header plug were missing. I quickly learned that these trim pieces are "unobtainable", new ones no longer produced and used ones nowhere to be found. After posting on the Z4 forums, several people recommended Mark Bouwman. Mark is an Engineer from the Netherlands, owns an E85 roadster, and faced the same problem after he purchased his hardtop. He saw there was a market for the caps and started 3D printing near duplicates of the trim pieces. He offered the option of either waiting for the next run or purchasing a set of OEM caps and a 3D printed plug. Not wanting to wait, I purchased the OEM set. They were as described, in “like new” condition and the 3D header plug fit perfectly. It took a little more than a week for the caps to arrive and Mark communicated with me throughout the process. If you need these pieces for your Hardtop, I would highly recommend contacting Mark!