as you say your k0 tank trims are like a letter"U"
they should be more like a letter"J"
and the lower side fits under the tank while the wider side will fit on the outside
the parts you have will not be genuine Honda parts they stopped makeing them many years ago ,they are aftermarket ones not a very good fit at all you may have to trim one side to fit properly and you will probably have to soak them in boiling water for a while to get them to bend. if you have a old tank then force them on that first
BTW be very careful with the stanley knife and count your fingers when you finished