1974 Duster Duck Wing...

I didn't know they were hollow. There really is no bottom support, just the 20 screws that bolt it down. Thought there would be some cross strip support, WHILE REMAINING HOLLOW. Who would want a 25 lbs rear wing? The trunk lid would slam closed all the time if it weighed that much....
Yea! Either you like that 70’s road car look or you don’t. I’ve had both over the years. The duck bill spoiler by DCC is awesome. Never had any issues with loosing up or leaks as long as you seal the screws with sealer. Again it’s looks only. I think the Gull wing Mach 1 spoiler is better for true down force working with you effect. I’ve yet to read any article about the effects of either on a car in motion.