My Hybrid Rover / Jeep project will have an all Ford drivetrain

I plan to use an ORD Doubler behind my T-18, have the 205...need the 203.

Trouble is...no way you can call yards anywhere within 1000 miles of here and ask for an NP 203.

So the best I can do is ask for xxxxx full-time transfer case.

What can I ask for?

Thanks

I know the 1/2 tons had them, not sure if 73 to 79 is correct, but I bet it's close. Also I've owned 2 3/4tons that had them as well both were 79's with 351M/C6/203/ frt 44/rear 60 if that helps