It does exist!

Went looking for the mythical early Magnum 5.2 fuel rail with the built-in pressure regulator. There was one '92 V8 Dakota at the Wrench-a-part in Lubbock Texas today, and low and behold, there it was!



Never seen one before, of course I never really looked until magnummopar mentioned there existence. Now I just have to redo my fuel lines to use it.