I have a 79 k-10 and one of the doors needs replacement due to rust in bottom. A friend has a door of a mid to later 80s blazer. From what i have researched the door will swap with no problem. But will I be able to us the 79 door panels or will i have to use a later style door panel? i just dont know if inside door panels attach the same way between the two different styles of panels? also he does not have the door panels just the door and glass. And i dont want to have to change out both door panels if i dont have to. the ones in it arnt in real bad shape. thanks in advance.