Had a Thule roofbox which I'd bought on TradeMe fitted to our Subaru Legacy. The owner of the business was both helpful and extremely knowledgeable. He advised that I might be able to fit Thule quick release brackets to the roof box. He spent a considerable amount of time fitting these brackets, at NO CHARGE. As a result, I now have a roofbox with quick release brackets, and all it cost me was an extra $100!