Toptube has to be repaired yes. I bet the easiest way is to use another toptube. To see the damage you have to check really good, thats the reason why I have not discovered any damage to the downtube....
This fork came with this bike. I had 2 different ones. The Merckx flats and these...These Aprebics have super tight clearance though and looks slick when build up.
No idea who the dj rod is m8... so no haha