I own a '76 2dr and it has a long coupling/& or short column, later mk2s +77 used longer column...maybe this is due to Ford milling up way too many mk1 lengths and just used them all up but with mk2 steering wheel spline, just a thort!
The steering shaft teeth going into the coupling are both the same for mk1 & mk2 as is the rack spline. tie rod ends are different of course!