Rear seat replacement...

I have an 1996 Blazer LT w/leather seats. I've noticed other Blazers have the "rear head-rest", as mine doesn't.

I would like to know if what year did GM start using the "rear head-rest", and if they would fit in my 1996 LT:

a.) can I just use the head rest and modify them to fit in my current seats;

b.) can I just purchase the back part of the seats, or

d.) do I need the entire rear seats?

Thanks in advance,

TuBlaz

Does the top of the seats have the holes for the headrests?