66 273 radiator/fan shroud dimentions

Great responses!
Yes the installed, square dimensions would be good to start with but the more critical ones of course are the diameter of the cut out as well as the offset from center on both planes. ( right/left-top/bottom). It might be hard to get much from the two formed pieces but good close up photos of those shapes and contours might give some direction. If I had one in hand I would probably trace them out to get a "general" line.
Of course I would just buy one IF it became available as well!! but now that I have started this in my head even if I found one I would still try to build it and get a decent drawing made to fabricate from. ( I can become obsessive)

Cheers. and thanks!
N