I am doing 6 on mine, but be aware that the 71 Demons also came with 4 bow headliners as well......Just in case you are having trouble sourcing the 6 set up.
I have the 3 hole slots in 5 places. I have 6 bows and new headliner but my bows are apparently for a duster and dont have the right ends on them. I have an early 71