Matt,
I have a used pair that are close in design to the ones you pictured. They were bought at a swapmeet and marked with tape that says Chevelle on them.
Think mine are Appliance since there is CH72 stamped on the tubes near the collector.
The Appliance catalog uses the first two letters of Chevrolet in their MFG number.
Picture of a flange with the Appliance MFG number CH 10 on them. 1976 catalog says fits Corvette.
You might want check and see if anything is stamped somewhere on your headers......Warren
