1982 - 1984 Plastic

[Midnite Mover]

Can anyone tell me what type of plastic was used for the bumpers on 1982 - 1984 Firebirds/Trans Ams. I believe the fender side vents and fuel cap cover is made from the same material. Also, can anyone recommend a good flexiblizer additive that would suit this plastic. I'm doing a full respray but don't want the paint to crack!

Thanx guys/gals.

Midnite Mover. (UK)