Hi again - Although the issue seems trivial, I used to buy "generic" sway bar end links for my Corvette - that frequently bent and failed - primarily because the bolt hardness was too soft. So I was hoping to get an original GM part for my TTA. Nope. Discontinued by GM. So I went to Auto Zone and had them pull a "generic" replacement. The bushings that I took out of my TTA were nylon, painted black - and are still salvageable. The "generic" Auto Zone part supplied me with rubber. The "generic" bolt is a grade 5 - though I was hoping for grade 8. So, though the solution is not optimal, it looks like I'm going to use the new bolt with the old bushings.
Thanks for the assist, Bob