My car is an 86 and it does not have these pieces in front of the radiator. I believe they came on later years, but not sure when they actually started installing them.

It seems like a very good idea to help direct air through the radiator. Since they are OEM pieces I'd like to see if I could find some.

If anyone has these pieces on their car and wouldn't mind taking a few pics of them I'd appreciate it.

Also, if anyone know of the part numbers that would be great too.

I got the drawing off gmpartsdirect. They name the parts as follows:
1. Air baffle upper
2. Side w/o AC
4. Damper Assy. cover
5. Extension (would probably need 2)
6. Damper Assy. box
7. shim
8. Deflector

Thanks,