OK, I guess it takes a 66 or 67 guy to find out something about 68s.
My resources for 68 are limited but I found some information in this Catalog of Chevelle, Malibu & El Camino ID Numbers 1964 - 87.
Apparently, Concours was an option (U.S.) in 68 and 69. It was an option on the Malibu line in both years the same way that the SS396 (RPO Z25) was an option on the various models in 69.
I found the following listings, but am not certain how to interpret them:
Special Sport Sedan........ZJ6
Concours Sedan ............ZK5
Concours Sport Sedan.......ZK6
Concours Sport Coupe.......ZK7
I found a picture of a 69 Concours Sport Sedan on the back cover of an old issue of the Chevelle Report. The ID Number book lists, Special Sport Sedan....ZJ6, as an option that year, but doesn't mention the other 3 RPOs that I found in 1968.
Perhaps someone with a 1968 dealer album could shed some light on this information.
How can we identify a car is a 68 Concours Sport Sedan rather than a 68 Malibu? Does the VIN or any body features give this away ?
The answer to this question probably is that you need documentation such as a build sheet that would reference one of the listed RPOs. Other than emblems on the front fenders, perhaps an interior code on the trim tag might be proof if the Concours included an upscale interior that was not available on the basic Malibu Sport Sedan. If you will, give us all the information off of the trim tag and the VIN. I do have some interior code information for 68 that might help if I had the trim tag info.