If you send the bolts back to marlin they will send the round kind back to you for free, you just have to pay for the shipping there. I had to do that too. They took them back even though i had them on the truck for a few months. It's an idea, i felt safer with the round kind.
im sure they would, but there is already paint on em...and...i dont really care, cause chances are in a few weeks i will be adding some trusses to the housing and then they will fit