I am planning to replace my dual master cyl. that I put on my 59 20+ yrs. ago, I think it was for a AMC Ambassador, not 100% sure, I was wondering if anyone has come up with a better unit over the years. I have the power brake set up under the dash, where can I get a rebuild kit for it, I did it about 20+ yrs. ago also. Thanks, Wayne, in Fl.