I have driver and passenger side R180 axle assemblies and would be willing to ship. If you are interested let me know or if you would like to see a photo email me at zedsn@hotmail.com
I have one for either a 240 or 280 and I can't remember. If you would like to see a photo email me at zedsn@hotmail.com to see if your wiring is the same.
You might want to rethink the z31 radiator idea and go with an aftermarket aluminum one after you take some measurements. The z31 radiator has a much bigger footprint and the mounting is much different than the 280. My 2 cents.
I have the black heater control dash panel with the center light that tilts ands is removable with 2 screws on the back if that is what you are looking for.