Oooo. Very interested in the metal replacements. I had this exact same problem in my old '00 aero. I couldn't get reverse when I 'properly' aligned the shifter. When I adjusted to find reverse, second became fourth and first became third. It was screwy. I spent a shit load of time trying to wrap my brain around it while everyone told me the trans was trashed. I didn't believe it. And it did all go south after I installed the GS short throw..
I never replaced my linkage, but I never saw how that could have been the problem.