Which preposition to use with preparatives

to Occurrences 10%

Perhaps, by way of preparative to the reading of Charles Lamb's letters, it will be well to run over once more the leading facts of his life.

for Occurrences 4%

Lustrations and sacrifices were not, however, the only preparatives for inducing the visionary disposition.

of Occurrences 4%

He administers physic with a farce, and gives his patients a preparative of dancing on the rope, to stir the humours and prepare them for evacuation.

Which preposition to use with  preparatives