I have a set of 1967 DG wheels which were required for the disc brake option in that year. I also have trim rings, a couple of which are not exactly correct but are passable for a driver and a set of center caps. I have hoarded these for my restoration that has disc brakes, but I discovered that the car was originally a drum brake car, so I opted to go with the 15 x 7 chrome rally wheels so I don't expect to ever put these on my car I may be interested in selling them and would like to hear from those that know better than me what they might be worth and how desirable they are. All comments appreciated!
The same 14" wheel with the same DG code was also used on Camaros and Chevelles, for the same reason, they fit over the factory disc brakes. I have one left from my younger days when I had several Chevys, one at a time of course. But even so these are still hard to find and not cheap, my guess is somewhere between $50 and $100 each for bare wheels when/if you could find them for sale.
You don't need disc brakes to use them if you are looking to be factory correct. They could have been ordered from the factory with drums or discs. They were just the only style "rally" wheel available for discs in 67/68.