I'm in the middle of swapping C4's in my car right now and one is from a mid 70's mustang, the other i'm pretty sure is stock. Where the kickdown bracket is and the shifter linkage bracket is, how do you remove the little stud type thing that they slide onto?

The brackets are different between trannys so i'm trying to put the bracket from old tranny onto new tranny but can't get the bracket to slide off or anything.