Where are you located in France?
If I understand you correctly, then what you really need is a pre-L manual.
The Pantera L came along in 1973 or so, and had a number of changes from the earlier models. The Panteras produced before this change (roughly serial number 4200) are often referred to as Pre-L, since they were sold before the L model. Perhaps it would be more proper to call them just DeTomaso Pantera, and the later cars the DeTomaso Pantera L, but people call them pre-L cars to indicate that they were built before the L model was introduced.
The parts book for a pre-L will work for you - unless of course your car is a very early 1971 and has pushbutton doors instead of the more typical pull-latch type of door.
That said, the cars were built in small series a long time ago - there was certain variation as they left the factory and who knows what has been done to the car in the 40 years it has been in circulation so there are no garantees. But it the best we have...