 Complete the following phrase:  The original two chassis were raced by Brabham and Rindt in the season opening 1968 South African Grand Prix, but with the BT26 ready in time for the next race, these two chassis were sold to local teams and left in South Africa, with Sam Tingle and Basil van Rooyen finishing third and fourth in that years South African Formula One Championship. Sam Tingle later took part in the 