Maybe you are referring to the smaller bolt holes on the X-Bracket? Read X Bracket here to press out the smaller hole inserts. I think others (in this thread somewhere) have also found the smaller bolts that works with the smaller hole inserts.
Key is to make sure the bolt head doesn't scrap / touch the logic board on install so a proper sized bevel head bolt sinking deeper into the original X Bracket beveled bolt hole is desirable.