I'm in the same boat with my black/ivory 1991. All of the colored trim pieces can easibly be swapped out with black except the door panels and the entire dashboard. :frown: Those two must be replaced as an entire unit. So, if you can find someone who wants to swap with your tan interior, you both will have to remove your dashes and door panels.
Buy one with a black interior The costs would be astronomical if you were to buy new pieces and not even sure they are all still available. You need to find someone to swap interiors with and even then, lots of work involved as mentioned in the post above.