I have a 1966 coupe that came equipped with 4 wheel manual brakes with a single master cylinder. I purchased a stainless steel front disc brake conversion kit from mustangs plus with a dual master cylinder. The problem I have is that when i installed the new dual master cylinder, and went to install the hard line fromt the master cylinder to the distribution block i found that the size of the nuts arent the same. The size of the pre bent line is 3/8 and the size of the port on the distribution block that connected to the old single master cylinder is 7/16. Do i need to get a new distribution block? Or can I change the way the distribution block is arranged. If i understand the instructions correctly i should be disconectting the rear line from the distribution block and connecting it in line with the proportioning valve directly to the master cylinder. I should be able to put the line from the master cylinder into that port that was for the rear and block off the other one. Although i am not too keen on jury rigging the brakes like that. Is there a way around this or do i need to get a different distribution block?