I found this guy selling them on E-bay.For $118.00+shipping
Item number: 170193558361
Gas Cap LeMans Roller Latch Corvette Camaro Firebird
Title: Gas Cap LeMans Roller Latch Corvette Camaro Firebird
Visit my eBay Store:HanesHotRodsandAntiques
LeMans Gas Cap
Original style flip top LeMans design with roller quick release latch and threaded flange for mounting.
Used on Cobra, Ferrari, Porsche, Corvette, Jaguar, VW Bug Herbie, Viper, Camaro, Firebird and many other race cars.
The flange is 5" OD and 3 1/4"ID
I want one too!