yes they have the same tracks. The backs are broken. Im also a fairly big dude. about 6'1" 200lbs. And the guy i bought it from was about the same size.
I'm really not certain how you break the back of seats in half, since it never happened to me before. But i guess older seats have a low...
Just got this car, prev owner said he went through 4 sets of seats. Even the driver seat thats in it now, the back is basically broken in half. At the same time, i hate driving a car with horridly uncomfortable seats.