Intermediate Shaft for an 81?

[Jeffsz28]

Can someone tell me what year intermediate shafts interchange with an 81? Do Firebird/Camaro interchange for the same year? The rubber boot on mine is coming apart and all the grease is gone. I'd rather remove/replace than rebuild.
I see some on ebay claiming to cover several years, like 70-81 or 78-81 or Firebird/Camaro. I'm very confused on this subject so someone please point me in the right direction. Thank You

 

[3SLO5]

early shaft is splined on the column yours is double d. yes camaro firebird interchange. most likely 78-81 think 77 is still spline shaft.

 

[Jeffsz28]

Perfect! Thank You!