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Carpet rear well hump alignment.
The humps are pretty much the same for all 1968-1977 cars in how they were inserted into the car. This picture above should help you determine which side is left, right, forward and back.
Note: This picture is only here to show you how to figure out front to rear up and down. Many people receive the rear carpet sets and can’t figure out which way the install in the car. Considering how “off” the molds were on this product until after 2014, it was even harder.
Corvette Rear Storage Compartment Suggestions on installation of carpet to doors and the over all reason why you should consider an assembly over building your old unit 68-82 Supporting Documentation
Corvette and Passenger Car Carpet Install Instructions from ACC Supporting Documentation