I don't know which one is considered type A, but some have used the Korky style fill valve.
Instructions are here
If it's the Korky style, the $2.50 assmebly cap can be replaced.
If it's the type with the screw adjustment, then replacing the fill valve with a Korky is the best solution. Lowes has them on the shelve, for $9.99
They also carry the G-Max flappers.