difference between a 65 dart steering box and 67 or later

wow thanks. so because being that the later box uses a larger bolt will i have a issue using it on it 65 k member? sorry i am not aware of how it mounts.... i have yet to remove it.

There earlier K uses a smaller size thread. You'll be fine using a later box on an early K member. If anything, use a washer or make some sort of bushing.