We can accommodate on the front end kit for the difference between the 68 and 73. In that case it would be best that you call and place an order. All you need to do is tell the sales person that the car is a 68 but has 73 and up single piston disc brakes on it and we will make the necessary changes to kit. Since this is a popular upgrade it we come across this often.
Thanks
James From
PST