K5 bench seat question
 

I recently found a nice matching front bench and 3rd row seat from an 85 suburban. I know the rear seat brackets will need to be 73-77 k5 seat brackets or till 78 burban ones. But my questions how are people mounting benches to the flat k5 floors? I know I could fab up some brackets but I'd rather bolt in. I know 67-72 trucks have bench seats with flat floors as well as the 87 plus trucks. Any of them should work correct? Also I didn't realize burb seats don't fold forward. Could I swap hinges from a matching year truck seat to make it fold? Thank you guys