Markos,
Forty-two years have passed since the last coupes came down the production line. Over these many years owners have replaced the kidney grille to suit their tastes, some like black, some like polished and others were repaired/repainted after an accident. We can both post photos but only those who were around when our coupes were new know the whole story. I have relied on Murray Fowler and other long time owners and the ETK. The black five slat was a CSL grille, but, that doesn't keep owners from replacing their polished grilles. Perhaps only in the US did polished grilles remain the standard through the 73 model year and the black four slat arrived on 74 models only in the US. Could the euro CSis have had black five slat grilles, someone with knowledge of these coupes could speak up, someone like Peder Mansson. Another coincidence is that when big bumpers arrived in 74 in the US, even the 2002 got a new four slat black kidney, different surround though, was this BMWs cost cutting move as the slats were now plastic? BMW is not a company that would be swapping grille designs back and forth in their production line or let their workers choose which grille to install.
What are your thoughts on the ETK?
Edit: just saw your last post, I also searched and can find just as many chubby grilles as the earlier style. A restored coupe is not a definitive answer unfortunately.
