Here is the parts diagram. This is from the Greenburg repair manual so the prices are early 1950s. I am not sure getting the trucks is going to be that simple. Best bet may be to buy any non working turbine and swap out the trucks. Best of luck. By the way the 682 is the best one since it has the additional eccentric crank on the drive line. None of the others have it. Both those trucks are die cast too.