Reclining buckets.. what years have them?

[Corpse]

My 83 K5 Blazer has buckets that dont recline... what year square bodies came with reclining buckets? ive seen trucks with them, and the seats look original.

thanks

 

[bucket]

'86-'91 got them, but they aren't a direct bolt-in. You need the mounts and all too.