the first pic is the early '72 and the red(ish) interior is Mike's
Agreed, Ineven edited my post but you quoted me too fast.

the first pic is the early '72 and the red(ish) interior is Mike's
Is it possible that you're car had a roof transplant at some point in life?
Finally got around to checking factory parts book. In the US, the 3.0CS got the Autoflug roof mount with the small storage shelf at VINs 2240143 and 2250071 so very early in the 72 model year. Lap belt was fixed as well as the shoulder belt of course and rear seat had retractable belt.
Earlier coupes had the Klippan style fixed belts with either the lift up latch and receiver or the claw style latch with a web mounted ring receiver (I’ve never seen these on a US coupe though).
The euro Model 73 and US Model 74 both got the rear mounted retractor shoulder belts with a fixed lap anchor.