I've noticed in many pictures of early t's with a two man top frame that the front bow is through the upper or lower hole bracket on the front vertical sleeve. Is there a reason for the choice?
If I read what you're saying, the two different positions you are referring to are for when the top is up or when you lower it. You use the top bracket in the up position and the lower bracket for when the top is down.
The early cars require the front bow assembly to be moved to the rear before lowering the top. On my '10 the lead bow is riveted to the second bow permanently and is very low and often bumped into when getting in and out of the car (don't ask me how I know). To lower the top the two front bows are detached and moved back as a unit. This was modified on the later cars by providing a higher pivot point for the lead bow but as a result putting the top down on those cars requires moving that bow to the lower pivot point on the second bow and then moving the entire assembly to the rear. A bit more work but a lot easier on the forehead!