The previous posters are right about the older conventional plow not fitting on your new truck. The only option you have to get this plow to work is to buy the unimount mounting kit, and then adapt the old style plow to fit the newer unimount set-up. This is exactly what I did. The result will be a hybrid type plow:
You won't have to permanently carry around the pump and lift frame during the summer months like a conventional plow, but it will take a little longer to hook up/disconnect, as you'll have to disconnect the lift/angle cables, power, etc.
To make it work, you will basically have to modify the A-frame to be shorter, and wider. This requires welding. Finally,the lift/light bar frame of the newer unimount type plows needs to be purchased, and mounting welded on the a-frame for it to mount to.
In short, it took me about a 1 1/2 days to get it to work. Might be worth it, but probably not.
Chris