73-77 bucket seat question

[1968vetL-71]

Hey all, I was curious if blazer backs would fit on truck bucket seats? I assume they would just screw on?? The seats are the same it looks like. I'm not familiar with these years of seats at all thats why i was curious. I'm wanting to put a set of factory low back buckets in my 76 K20 Crew and want to make it look factory. Obviously i would need the backs on the seats since they would be exposed to the rear of the cab. I just want to know for sure what i need before i purchase a set of seats. I know i need the truck brackets for the floor so thats a for sure thing i need. Just want too make sure on seats.

Also, never heard anyone chime in on wether or not the foam was reproduced??

Thanks in Advance.