That's the one I bought. There's no way it would fit over the nipple. The OD of the duckbill hose is smaller than the OD of the nipple!
The description has a note that seems true to the ES, in my case: "Can be adapted to the electric start bikes with a small piece of slightly larger diameter hose."
Keep an eye on that breather system with the duckbill after you put it on.
The late model bikes with the breather off the oil tank don't breathe well, because the breather was never supposed to be moved to that location. It was some form of "pollution control update" that never worked well. The breather should be on the side of the crankcase, as shown in t120bullet's photo. We always retrofit that breather on all performance bikes because that's the type that really works.
That being said, what you want to do in the meantime with your 2008 is to run a piece of hose that fits that nipple in the top of the oil tank, and run it straight up to the area under the seat, and THEN make your turn of the hose to wherever you want the outlet. That acts as a "stand-pipe" for the breather, so that any liquid oil being spewed out will probably not make it up that high, and run back down into the oil tank.
You can put the duckbill on the end of that hose, wherever you want to lead it. I lead it along the fender brace to the tail of the bike, and terminate it with a duckbill near the license plate. Others run it to the chain area as a "chain luber", but I'm not really a fan of that.
Anyway you can run it where you want. The "stand pipe" routing is important because the newer oil tank breathers tend to eject oil in fairly significant burps, and that's why there are all the complaints about oil-soaked air filters, etc.