Big Block Mopar 1.6 Ratio Roller Rocker Arms - New

I do not know the Mopar part numbers. You could use these Hughes engines shafts as one option. Rocker arms unlimited, Isky and Comp Cams may also have a suitable shaft to choose from.
You will also need rocker spacers, hold downs and bolts to run these just like iron adjustable big block rocker assemblies.

Hughes Engines