I have a 1986 camaro iroc z with the rear aluminum drums and the part store keep giving me the wrong wheel cylinders. I have the metric thread cylinders and they have the short brake line nut on them. The problem I am having is the thread is right pitch but it is bored to deep and the nut bottoms out against the wheel cylinder before making a seal. Does any one know where I need to go to get wheel cylinders that will work. Your input would help me out a lot thanks