For vintage race Minis using period-correct SU H4 carburetors. These float bowl extensions help to eliminate fuel surge on the track. This in done by increasing the volume of fuel in the float bowl. The bolts supplied are manufactured longer so the oroginal breather can be retained (breather not shown). Kit includes two float bowl extensions, four gaskets, and two longer bolts
Second image is an example of what the kit looks like when installed.