For vintage race Minis using period-correct SU H4 carburetors; these float bowl extensions with floats help to eliminate fuel surge on the track. This in done by increasing the volume of fuel in the float bowl, partly due to the extensions and even more so with the smaller, genuine SU “Stay Up” floats. Kit includes two (2) float extensions, four (4) gaskets, two (2) longer bolts, and two (2) small floats.