[b-man]

Originally Posted by Hikin Mike

To my knowledge, those are only for A/C cars.

I’m not absolutely sure about their usage but I can tell you the ‘68 pictured in my first post had both plates intact (they’re in the trunk, note that all the hardware to attach them is there) and it’s not an air conditioned car.

Used on 400 cars as well from what I’ve read.

Main point being is get some plates if it’s not originally equipped with them, they’re definitely needed for a car with a 455.