There's no magic formula to these valves, I have used Wilwood adjusty ones in the past, but these were inside the car(escort), just a case of plumbing it in, once set will not need any further adjustment, some extend the pipes and have the valves inside the car, but a bit more work of course.
I would have a look around the breakers, at Fords see what other ones use a similar valve that have rear discs, especially newer models as may be able to order/use these, saves hassle.
If you do end up fitting a bias valve, make sure you set it up in the wet.
tabetha