53 You have two choices when you go with dual reservoirs. Either the 4 bolt or the newer 80's 2 bolt aluminum style. With the 2 bolt style you will need adapter plate also. The nice thing about newer is plastic reservoir w/screw on caps and it weighs 11 pounds less than other. Main body is aluminum. I just did mine that way. When I did mine I also changed all the lines,hoses,etc. I got all lines from fine lines brake lines in Ohio. Everything was pre-bent and went in its place. The worst one was the crossover on the firewall. I suggest if you need to bend any lines go buy a pair of those tube bending pliers. (harbor freight) Easier to use. Not difficult to do you just need to have alot of patience. Fine lines does have lines for your 65 I checked.