Shameless plug, I have a 29 spline 241DHD in the classifieds.
205- unless you find the rare 205 behind the 88-93 dodge cummens with getrag 5-speed, plus the round adapter, it is tough. You can get the other machined to fit a 29 spline input, but the parts cost like 500 bucks. Then you still need to find the adapter.
Can buy atlas or stak t-case with 29 sline input, but again, big bucks.
Supposedly dodges had two NP241s behind the NV4500. Both 29 spline. One a 241DHD and the other a 241DLD. There are many different lenght input shafts, two diameter main shafts, two different gear pitches on input shaft, ets. I am trying to adapt a 29 spline input from a NP241DLD to a earlier model pasenger side drop 23 spline NP241D. Will post back with progress. Good luck
Blake