Since I have had a lot of people looking at this post, but no replies, it is quite possible that there is no one answer that is correct. As I have been working on this car I have found that there were signs that the roof has sustained what has appeared to be possible damage from a tree that may have fallen on it from some time in it's distant past. The tree, or what ever it was fell almost right down the middle of the car, but slightly off towards the drivers side, doing most of it's damage to the very front, and the very back end of the roof. So perhaps this is the reason there is a difference in the position of the bows from one side and the other, and front to back.
My next question is, since I am planning on doing the installation myself, and I did purchase a upholstery book, but it is vague on details, and recommends a factory assembly manual for more details into the steps of how the head liners are installed, do the factory manuals get into this? and if so are there differences between the manuals from one source to the next, ie from vender to vender? and is so, who would you recommend buying one from?
Rusty in NC