Can anyone tell me what year Firebirds had a dash pad with two ridges on the edge? I bought a dash from a friend of my dad's for $50 to replace the cracked one in my 88. I already installed it and it looks fine, I just wondered what it came out of.

 

The 2 ridge style was up to 84, the 85 style was the 1st year for the smooth edge style.

 

Thanks