69 Dart Swinger/New sunvisors.

So, one of my sun visors is chewed to hell from a mouse. I cut the vinyl off. I see the rod that came with the factory part doesn't just slide out. When I look to new replacements they say I need to use the original rods etc. I don't understand how the rods can go back inside the new visors......anybody replace these? Suggestions on the bet place to get them?