1966 Dart GT Roof Trim Help

I haven't dealt with that particular trim piece, but I assume the trim clip attaches through a hole in the roof?
Got a pic of a complete clip, and where it mounts through the roof? What are the dimensions of the clip, trim and the hole it attaches through? I may have a way that has worked for me with oddball trim and unavailable clips, but I want to make sure we're on the same page here first.