The GP 60 size floats are designed for the GP 60 size cub kit, which is a giant scale airplane. They are rated for 8-15 pound airplanes with wingspans in the 90" area and the floats, with struts and spreaders, will weigh about 4 pounds when finished. They are way too big for either one of your choices.

I have a set on my 11 pound 4* 1.20 and they are even a little big for that airplane.

Jim