As long as the application is the same, year for year and the same application. In other words you don't want to try making a 69 FMX set of lines fit a 65 C4
The lines (if I remember correctly - but surely someone will remark if I screwed up) were tin dipped originally. Would guess that the reproductions are zinc coated
The rods attached in the middle of some radiators are often missing (left off by rebuilders) I think are just designed to hold the side straps in place or deforming outward. I'm sure they could bend outward from a number of things.