The only thing I can think of is the space is to allow for manufacturing differences, or so it can fit more than one model of tractor. It sounds like yours is engaged enough to prevent up and down movement, which would be the most important part at the front. The main mounts prevent movement back and forth, as well as up and down, so I would tend to think it would be ok. But if I had my choice, I'd rather have the front engaged all the way, it just seems better.