There were 3 versions of Door handles used on the 1973-1987(91) trucks:
1973-76 – thin with a curved tip, offset to the top in the mount. Will only work with related door panels .
NOTE these are currently not reproduced by our suppliers
1977-80 – Thick(wide) with a curved tip, centered in the mount. Will only work with related door panels.
Link to our store for the 1977-1980 Inner Door Handles 
1981-1991 – Thin and straight, offset to the bottom. Will only work with related door panels.
Link to our store for the 1981-1987(91) Inner Door Handles 