I have a Gravely 152 XDZ mower and am interested in a mulch kit. This is for homeowner use and I have no interest in bagging (I would rather cut twice than bag). There are two part numbers listed: PN 79206400 is the 52" Mulching Kit and appears to consist of baffles and blades. PN 79100800 is the 52" Dischage Cover and is self explanatory. Do I need both or will the baffles be enought to keep the clippings inside. Has anyone just used the discharge cover and lift/mulch blades? The goal is to mow the lawn every 7-10 and never have to rake piles of of grass.