by Christer (Christer) » 07 Apr 2002 20:30
It appears to me that the wide mouldings were used both in 1970 and 1971!
They were listed as part numbers 3419792 (right) and 3419793 (left).
They were held on by nine retainers, two nuts and two screws.
(Source: 'Challenger & Barracuda Restoration Guide' by Paul Herd)
Good luck, Steve!