Which preposition to use with quintals

of Occurrences 15%

Note that a cara is 4 quintals of Balsara.

per Occurrences 1%

The quantity exported to other parts of the Regency, as well as to foreign countries, where their fine quality is well known, is in round numbers on an average from three to four thousand quintals per annum.

to Occurrences 1%

As to the abundance of the plantations, the fruit of one plantation alone producing fifteen hundred camels' loads of dates, or four thousand five hundred quintals, three quintals to the load, is not unfrequently sold for one thousand dollars.

Which preposition to use with  quintals