I don't remember all the details, but our experience is that they're not the same. My son is restoring a '71 big block challenger convertible, and the convertible rod (rods?) is/are shorter, due to the way the top mechanism encroaches into the space at the upper front sides of the trunk compartment. We couldn't find an original one; but one can be fabricated from a regular one. Just mark along its length with a permanent marker, and then cut it and reweld it. Line up your marks when you weld it, and the ends will then still be in the proper relationship to one another. I don't remember if there was one or two; I just remember the trouble we had. Hope this helps.