I have a Hustler SuperZ, 54" XR7 Deck. My Hustler dealer installed a mulching kit on it last week. He had to remove two 14" pieces of metal, that made a right angle turn to bolt onto the front underside of the deck. This was necessary to install the mulching kit. My question is, is this the same as the Air Containement Kit? According to you last response, since my serial number starts with 06, the part number would be 107639. Is there a picture of this part? Thanks!