Hi Ulf. I bought one from Dantes for my 66, but it came as a full top which covered the sail panels. Then, I researched for stock flat material. The company is out of Illinois, and the company is DLT Upholstery. What I ordered was 2.0 (Two) yards of Landau T 848 49" (49 inch)
Levant Black 04. The salesperson was Julie Kahn. DLT Upholstery Supply is located at:
The price I paid was $12.30 / Yard where I ordered two yards for a total amount of $34.52 including tax and shipping. This was ordered on 04/11/2018, so I imagine the price has changed. If you will recall, I have a small tutorial on my 65 Dart Charger Clone build on my thread 65 Dart Revisited II.
Well Ulf, I hope this helps you out, and thanks for the advice on my 65 Dart Build.