I had one in my Cherokee, and have the 760D/200D and TRT-250D Txpdr in my RV-4 panel, still wiring, but no problem making them fit. By the way, I assume you mean the digital display units, not the thumbwheel counterparts.
The 200D has standard outputs to a CDI, so any one should work. The Tri-Nav C is a neat CDI if you've never flown behind one, and also will take standard Loran/GPS signals. However, if the 200D does not have an internal GS, it does not provide the channeling signals for an external GS receiver, such as a KN-75 (Don't ask me how I know this

)
Free Flight Systems down in Waco, TX still supports the digital series units.