OBD 2 with arduino Due

No, sorry I can´t.
I don´t owe one of these shields.

They are all well documented, so please read their datasheets and find out how to connect each shield. Then you´ll know which Arduino Pins are used by both of them and which can possibly changed within the code, to work around that.
Afterwards, you can download example sketches from the shield manufacturers, change the pin allocation, according to your insight from above.

That´s how I´d do that.
But you will not get round to read the documentation! If you don´t understand how it works, from the hardware perspective, as well as from software side, you will never get a working solution.
I know it´s annoying, but nobody ever combined both shields before. So understand what they where doing and how it works, first.