Just FYI - but all 70 doors are interchangeable between coupe, convertible and fastback. Coupe glass will even work, but fastback door would have to get different glass to fit. This might help you find one easier.
I have a good '70 drivers door for a coupe/convertible. It is a very solid door that has been hot-tanked to remove paint etc. The front edge has been slightly wrinkled and straightened (probably from a minor accident). The door is bare with no glass or mechanicals. I have pics available. $225 + shipping. I recommend shipping via Greyhound bus line. They are very reasonable for large or heavy items. I am located in Pasco, WA (99301). My [censored] user ID is 'skiddmark' for your consideration.