I bought a 20 year old Wilderness Systems Piccolo (youth model) and the floats were also 20 years old. These new ones are about 2 inch longer for front and 1 inch longer than original rear floats. But the exact same proportions. The other floats I considered were way more expensive and didn't fit as well. I give these guys a little extra puff before I take the yak out and they work excellently.