Head liner

The earlier ones used bows and the later ones used a hardboard headliner. I think the cutoff year was 71-72, but not 100% sure.
From what I have read today 70 was the last year of the cups to hold the listing wires. My 70 super bee has them. My 71 scamp has 3 holes for adjusting wire tension and a curved end on wires. My problem is finding the orntation of the wires. Still looking for a answer.