No, I don't because I don't race my '65. But I have been moderating Mustang sites for several years now and this subject comes up often. The one thing about polyurethane bushings is when you install the bushings, buy more of the special grease that comes with them, and grease the crap out of them before installation. Once installed, You'll never have to replace them again under normal use. You won't have any squeaking, and you will have a solid suspension. Keep in mind they are for racing situations, so if you don't race, then save the money and get rubber ones.