I have a NOS 69 transverse on my 67 GT350. It was bought with all of the parts to restore the car around 1976-77. I would have to go out and look at the date on it again , it's still on my car, looks new still, my complete exhaust system for the 67 is also NOS from the same time period. Parts were installed when the car was restored in 1996, and has travelled around 2200 miles since, no rain.