Well, here's a stock, 17,000-mile unrestored '69 RR's trunk lid. SPD 2/12/69, St Louis.
'68-'69, there were 2 versions of the underside: a panel with cut-outs, and the full panel.
OP's car has base interior but Decor Group B-pillar caps. Those caps were available separately, but that's extremely rare.
I've seen the cracking mentioned on 1 or 2 HT B-pillars, but not on Coupes.
What I've seen of the subject car so far indicates a past incorrect restoration, and likely some major repairs early in its life.
I'm not buying special bodywork by the factory; I don't recall seeing a similar car in any of the early road tests or the traveling caravan Plymouth had.
It's good to keep info exchange.
THe quarter skin will crack where it transitions into the jamb. It would be interesting to see if the torque on a post car would result in cracking there. If the incorrect resto prevails I'd say this car has lead a pretty pampered if not mostly stationary life.
Again info exchange to find out more.
